Preserve bounded validation evidence and historical failures

2026-10-15 10:13:51 +08:00
1 parent cdbb9c42f6
commit 263f3b0c7a
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+CPUREF-0.3 local integration and review — 2026-10-13
+
+Result: PASS. First local execution only; no retry or tolerance change.
+15 core tests + 5 supplemental tests passed, plus 1 open-corner negative-control
+method (identity/SRT, seeds 1/2, 1/8 coarse steps). The supplemental suite includes
+the v0.2-to-v0.3 diagnostic-field delta check; this is not physical-field equality.
+
+Scope: fixed doubly periodic 16x16 coarse grid, one static 2:1 patch covering
+[4,12)^2, 16x16 active fine cells with halo 4. Evidence concerns transport,
+corner handling, validity, ownership, conservation and bookkeeping only.
+It does not validate interface accuracy, viscosity/stress transfer, long-time
+stability, production GPU equivalence, dynamic AMR or Jet integration.
+
+Static review completed before execution; no substantive objection within this
+scope. Checked arrival_f phase, even integer tick and +2 advancement, collision
+order, both fine hops, ghost validity/poisoning, eight uniquely keyed corner-pass
+links, coalescence ownership and budget semantics. bookkeeping_check subtracts
+interface_residual and is not independent conservation evidence. Core tests
+provide a separate scalar transport/SRT oracle and active-leaf totals. Negative
+control sums leaves outside the reference helpers, but uses reference masks and
+collision budgets; do not describe every aspect as independent.
+
+Delivery: five Python files were moved from review staging into the parent
+multigrid directory without changing bytes. cpu_reference_v0.2.py is retained
+only as the supplemental diagnostic comparison fixture, loaded explicitly.
+Seven delivered artifact SHA256 values match the supplied originals both before
+and after execution. No reference algorithm, test assertion or tolerance edits.
+Grok's original README and stdout remain unchanged alongside the local evidence.
+
+Local environment: /home/frank14f/anaconda3/envs/pycuda_3_10/bin/python
+Python 3.10.13; NumPy 1.26.4; Linux 6.8.0-138-generic x86_64, glibc 2.35.
+Grok reported Python 3.13.5 / NumPy 2.5.3; both original and local outputs are kept.
+Process-only environment:
+  OPENBLAS_NUM_THREADS=1
+  PYTHONDONTWRITEBYTECODE=1
+  PYTHONNOUSERSITE=1
+  PYTHONPATH=/home/frank14f/CelerisLab/tests/validation/multigrid
+  CPU_REFERENCE_PATH=/home/frank14f/CelerisLab/tests/validation/multigrid/cpu_reference.py
+Working directory: /home/frank14f/CelerisLab/tests/validation/multigrid
+Each script was executed sequentially by the following command, replacing SCRIPT
+with test_cpu_reference.py, test_tron_additions.py, then
+test_open_corner_negative_control.py (absolute paths in results_horsea.json):
+  /usr/bin/prlimit --as=268435456 --fsize=2097152 --core=0 -- /home/frank14f/anaconda3/envs/pycuda_3_10/bin/python -B SCRIPT
+The stdlib-only parent runner had the same hard limits. stdout and stderr of all
+three scripts went to one shared stdout_horsea.txt; any nonzero exit would have
+stopped subsequent execution. Per-case step ceiling of 8 was verified statically;
+no grid, seed or step expansion. Peak child RSS across the run: 37.5 MiB.
+Combined local stdout/stderr plus command metadata: 9013 bytes (<2 MiB).
+
+Observed evidence: identity versus scalar oracle max difference 0; SRT max
+2.776e-16. Eight-step SRT mass drift -1.535e-12 passes the unchanged delivered
+mass-scaled 1e-14 tolerance (approximately 2.56e-12 absolute). Open-corner SRT
+maximum drift reaches 2.078e-3; closed negative-control drift stays <=5.684e-14.
+The eight-step mass tolerance is not an absolute 1e-14 bound.
+
+Increment: only new files under tests/validation/multigrid. No src, old test,
+MULTIGRID_VERIFICATION_STRATEGY.md, DynamisLab, dependency, environment or Git
+commit/push changes. No CelerisLab/Simulation/pycuda imports or GPU/solver runs.
+The original 269-file hash baseline and Git status are in baseline.json; final
+verification and new-file sizes/line counts/SHA256 are in manifest.json. Ordinary
+git diff omits these untracked additions; the manifest describes this increment.
+No generated bytecode or duplicate candidate copies were retained.
+
+Stopped after this authorized test-only integration for joint review.
@@ -0,0 +1,18 @@
+# Grok independent tests for CPUREF-0.3 (2026-10-13)
+
+Runner: Grok's isolated sandbox (not aws-la, not Horsea). Python 3.13.5, NumPy 2.5.3, Linux x86_64. No installs, no Horsea/remote writes.
+Command: `OPENBLAS_NUM_THREADS=1 prlimit --as=268435456 python test_cpu_reference.py` then `test_tron_additions.py` and `test_open_corner_negative_control.py` (reference copied unchanged to `cpu_reference.py`; `CPU_REFERENCE_PATH` accepted).
+Budget: <=8 coarse steps per case, address space capped at 256 MiB, peak RSS ~43 MiB, stdout <2 MiB.
+
+SHA256
+- cpu_reference_v0.3.py (Drive 1G_a5i4ywwAgz20Binl9jI_d_SyXvfCJK): bba2a06a9f6517b32079ffff15e4060d8c3b7ed35f16ca134e1877226c9e4e1e
+- test_cpu_reference.py: ade5d4827f971aed7174b59d83769e7aa542338e625a9fc8db1e8b1805cb74ca
+- test_tron_additions.py: 8e7a6a90b85e64c7326719e7b8bca2f6d34fb4c80690f0685f7e291ab93bd2a4
+- test_open_corner_negative_control.py: 59a6f8ca80cdd63cb7827fbebf9b4b555c3793f19dd6bca801544ec10b5cbe1b
+- stdout_final.txt (20 unittest OK): 73e4ef01138842981daaa534390f1463839e63833c11f4e8872f94f8eaadc717
+- stdout_open_corner.txt: 927f8233957fe08f671cf3716e810431c40331caa4cf406da2b09793337c7ee8
+- contract still ee8010e763d38937b95c34dadaf97415cdb8b6c23e3c79a9f1f32bd5d4e112f6
+
+Result: 20/20 pass (15 core adapted from v0.2 suite + 5 additions: NaN masks, 8 unique corner keys/packets, coalesce_paths reconstructed test-side, hop2_valid, v0.2↔v0.3 field delta) plus open-corner negative control OK. Reference unchanged.
+
+Adaptations vs v0.2 tests: drop explosion_count; fine_valid_after→hop2_valid; closure_error→bookkeeping_check; corner_packets keyed lower_left_q8 etc. (8 unique); coalesce_paths rebuilt in tests; invalid tick (odd/float/bool/str) rejected; even tick advances by 2.
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+=== CPUREF-0.3 Grok independent suite (15 core + 5 adapted additions) ===
+test_corner_pass_links_identity_marker (test_cpu_reference.TestFourCorners.test_corner_pass_links_identity_marker)
+Identity: a marker in the source's post-collision slot q must arrive exactly at K. ... ok
+test_four_corner_symmetry_srt (test_cpu_reference.TestFourCorners.test_four_corner_symmetry_srt)
+Mirror the lower-left SRT corner case to the other three corners; values must match. ... ok
+test_leaf_mass_momentum_8_steps (test_cpu_reference.TestIdentityTransportConservation.test_leaf_mass_momentum_8_steps) ... ok
+test_matches_independent_implementation (test_cpu_reference.TestIdentityTransportConservation.test_matches_independent_implementation) ... ok
+test_coalescence_slots_reads_owner (test_cpu_reference.TestOwnershipPoison.test_coalescence_slots_reads_owner) ... ok
+test_collision_and_explosion_counts (test_cpu_reference.TestOwnershipPoison.test_collision_and_explosion_counts) ... ok
+test_hop_sources_never_outer (test_cpu_reference.TestOwnershipPoison.test_hop_sources_never_outer) ... ok
+test_inputs_not_mutated_and_maps_readonly (test_cpu_reference.TestOwnershipPoison.test_inputs_not_mutated_and_maps_readonly) ... ok
+test_invalid_input_entries_ignored_and_poisoned (test_cpu_reference.TestOwnershipPoison.test_invalid_input_entries_ignored_and_poisoned) ... ok
+test_make_spec_api (test_cpu_reference.TestOwnershipPoison.test_make_spec_api) ... ok
+test_nonfinite_active_input_rejected (test_cpu_reference.TestOwnershipPoison.test_nonfinite_active_input_rejected) ... ok
+test_leaf_conservation_and_collision_moments_8_steps (test_cpu_reference.TestSRT.test_leaf_conservation_and_collision_moments_8_steps) ... ok
+test_matches_independent_implementation (test_cpu_reference.TestSRT.test_matches_independent_implementation) ... ok
+test_identity_changes_expected_packet (test_cpu_reference.TestSRTCornerOracle.test_identity_changes_expected_packet) ... ok
+test_srt_oracle (test_cpu_reference.TestSRTCornerOracle.test_srt_oracle) ... ok
+test_eight_unique_keys_and_child_packets (test_tron_additions.TestCornerIndividualPackets.test_eight_unique_keys_and_child_packets) ... ok
+test_coalesce_paths_reconstructed_test_side (test_tron_additions.TestRetainedDiagnostics.test_coalesce_paths_reconstructed_test_side) ... ok
+test_hop2_mask_semantics (test_tron_additions.TestRetainedDiagnostics.test_hop2_mask_semantics) ... ok
+test_srt_coarse_and_fine_nan_masks_equal (test_tron_additions.TestSRTNanMask.test_srt_coarse_and_fine_nan_masks_equal) ... ok
+test_diagnostic_field_delta (test_tron_additions.TestV02V03FieldDelta.test_diagnostic_field_delta)
+Compare top-level diagnostic keys and budget keys between v0.2 and v0.3. ... ok
+
+----------------------------------------------------------------------
+Ran 20 tests in 0.480s
+
+OK
+reference: /workspace/amr_tests_v03/cpu_reference_v0.3.py API CPUREF-0.3
+sha256 bba2a06a9f6517b32079ffff15e4060d8c3b7ed35f16ca134e1877226c9e4e1e cpu_reference_v0.3.py
+sha256 ade5d4827f971aed7174b59d83769e7aa542338e625a9fc8db1e8b1805cb74ca test_cpu_reference.py
+sha256 8e7a6a90b85e64c7326719e7b8bca2f6d34fb4c80690f0685f7e291ab93bd2a4 test_tron_additions.py
+python 3.13.5 numpy 2.5.3 Linux-6.12.94+-x86_64-with-glibc2.41
+
+reference corner_links lists 8 uniquely keyed corner-pass links
+
+corner SRT symmetry values: {'LL': np.float64(0.02798201349283891), 'LR': np.float64(0.027982013492838912), 'UL': np.float64(0.02798201349283891), 'UR': np.float64(0.02798201349283891)}
+
+[identity] leaf0=[255.98790565531962, 7.683069168222897, -5.122316610476732] leaf8=[255.98790565532028, 7.683069168222904, -5.122316610476715] drift=[6.536993168992922e-13, 7.105427357601002e-15, 1.687538997430238e-14]
+
+[identity] max |ref - independent| over 3 steps = 0.000e+00
+
+slots=100 (corner-pass 8), unique reads=400, max read multiplicity=1
+
+counts: coarse cells collided once=192, fine twice=256, ghost explosion writes=320; tick validation OK
+
+[srt] leaf0=[256.01002619890596, 7.680601714336587, -5.120130711410963] leaf8=[256.0100261989044, 7.680601714336586, -5.120130711410962] drift=[-1.5347723092418164e-12, -8.881784197001252e-16, 8.881784197001252e-16]
+
+[srt] max |ref - independent| over 3 steps = 2.776e-16
+
+[identity corner] expected=0.026777777777777775 got=np.float64(0.026777777777777775); srt-expected differs by 1.204e-03
+
+[srt corner] expected=0.02798201349283891 got=np.float64(0.02798201349283891) diff=0.000e+00 (uncoalesced g8=0.028027777777777776)
+
+[8 corner keys] ['lower_left_q7', 'lower_left_q8', 'lower_right_q5', 'lower_right_q6', 'upper_left_q5', 'upper_left_q6', 'upper_right_q7', 'upper_right_q8']; packets 3xg8+1xmid8, weights 0.25, avg=0.02798201349283891
+
+[coalesce_paths test-side] 100 rows x 4; hist={('corner_pass', 'A', 'I'): 8, ('corner_pass', 'I', 'I'): 24, ('face_or_diag_from_patch', 'A', 'A'): 180, ('face_or_diag_from_patch', 'I', 'A'): 188}
+
+[hop2_valid] matches independent derivation; valid inner=1060; reads hop2-valid=400
+
+[srt masks] coarse+fine NaN masks equal over 3 steps; max diff 2.776e-16
+
+[v0.2→v0.3 fields] removed=['coalesce_paths', 'explosion_count', 'fine_valid_after'] added=['hop2_valid']; budget rename closure_error→bookkeeping_check; corner_packets 4→8
+peak_rss_MiB 42.6171875
+RESULT OK testsRun 20
+
+=== open-corner negative control ===
+test_open_vs_closed (__main__.OpenCornerNegativeControl.test_open_vs_closed) ... ok
+
+----------------------------------------------------------------------
+Ran 1 test in 0.215s
+
+OK
+[identity] coalesce rows closed=100 open=92 dropped=8
+[identity] seed=1 steps=1 closed: max|leaf drift|=5.551e-17 max|interface_residual|=2.109e-15 | OPEN: max|leaf drift| (mass,mx,my)=(0.000e+00,5.551e-17,2.776e-17) max|interface_residual|=1.776e-15
+[identity] seed=1 steps=8 closed: max|leaf drift|=2.776e-16 max|interface_residual|=2.276e-15 | OPEN: max|leaf drift| (mass,mx,my)=(0.000e+00,2.220e-16,2.776e-16) max|interface_residual|=2.665e-15
+[identity] seed=2 steps=1 closed: max|leaf drift|=3.331e-16 max|interface_residual|=1.971e-15 | OPEN: max|leaf drift| (mass,mx,my)=(0.000e+00,1.665e-16,3.331e-16) max|interface_residual|=2.665e-15
+[identity] seed=2 steps=8 closed: max|leaf drift|=5.684e-14 max|interface_residual|=2.998e-15 | OPEN: max|leaf drift| (mass,mx,my)=(5.684e-14,2.220e-16,3.331e-16) max|interface_residual|=2.665e-15
+[srt] coalesce rows closed=100 open=92 dropped=8
+[srt] seed=1 steps=1 closed: max|leaf drift|=2.269e-14 max|interface_residual|=2.831e-15 | OPEN: max|leaf drift| (mass,mx,my)=(2.078e-03,8.560e-04,2.620e-04) max|interface_residual|=2.078e-03
+[srt] seed=1 steps=8 closed: max|leaf drift|=4.040e-14 max|interface_residual|=4.774e-15 | OPEN: max|leaf drift| (mass,mx,my)=(2.078e-03,8.560e-04,2.620e-04) max|interface_residual|=2.078e-03
+[srt] seed=2 steps=1 closed: max|leaf drift|=4.078e-14 max|interface_residual|=2.331e-15 | OPEN: max|leaf drift| (mass,mx,my)=(5.660e-04,2.359e-04,6.755e-04) max|interface_residual|=6.755e-04
+[srt] seed=2 steps=8 closed: max|leaf drift|=4.078e-14 max|interface_residual|=2.554e-15 | OPEN: max|leaf drift| (mass,mx,my)=(6.526e-04,5.767e-04,1.401e-03) max|interface_residual|=1.401e-03
@@ -0,0 +1,130 @@
+{
+  "started_utc": "2026-10-13T03:42:59.253863+00:00",
+  "cwd": "/home/frank14f/CelerisLab/tests/validation/multigrid",
+  "python_executable": "/home/frank14f/anaconda3/envs/pycuda_3_10/bin/python",
+  "environment": {
+    "OPENBLAS_NUM_THREADS": "1",
+    "PYTHONDONTWRITEBYTECODE": "1",
+    "PYTHONNOUSERSITE": "1",
+    "PYTHONPATH": "/home/frank14f/CelerisLab/tests/validation/multigrid",
+    "CPU_REFERENCE_PATH": "/home/frank14f/CelerisLab/tests/validation/multigrid/cpu_reference.py"
+  },
+  "limits": {
+    "address_space_bytes": [
+      268435456,
+      268435456
+    ],
+    "output_file_bytes": [
+      2097152,
+      2097152
+    ],
+    "core_bytes": [
+      0,
+      0
+    ],
+    "max_coarse_steps_per_case": 8
+  },
+  "runs": []
+}
+
+COMMAND /usr/bin/prlimit --as=268435456 --fsize=2097152 --core=0 -- /home/frank14f/anaconda3/envs/pycuda_3_10/bin/python -B /home/frank14f/CelerisLab/tests/validation/multigrid/test_cpu_reference.py
+test_corner_pass_links_identity_marker (__main__.TestFourCorners)
+Identity: a marker in the source's post-collision slot q must arrive exactly at K. ... ok
+test_four_corner_symmetry_srt (__main__.TestFourCorners)
+Mirror the lower-left SRT corner case to the other three corners; values must match. ... ok
+test_leaf_mass_momentum_8_steps (__main__.TestIdentityTransportConservation) ... ok
+test_matches_independent_implementation (__main__.TestIdentityTransportConservation) ... ok
+test_coalescence_slots_reads_owner (__main__.TestOwnershipPoison) ... ok
+test_collision_and_explosion_counts (__main__.TestOwnershipPoison) ... ok
+test_hop_sources_never_outer (__main__.TestOwnershipPoison) ... ok
+test_inputs_not_mutated_and_maps_readonly (__main__.TestOwnershipPoison) ... ok
+test_invalid_input_entries_ignored_and_poisoned (__main__.TestOwnershipPoison) ... ok
+test_make_spec_api (__main__.TestOwnershipPoison) ... ok
+test_nonfinite_active_input_rejected (__main__.TestOwnershipPoison) ... ok
+test_leaf_conservation_and_collision_moments_8_steps (__main__.TestSRT) ... ok
+test_matches_independent_implementation (__main__.TestSRT) ... ok
+test_identity_changes_expected_packet (__main__.TestSRTCornerOracle) ... ok
+test_srt_oracle (__main__.TestSRTCornerOracle) ... ok
+
+----------------------------------------------------------------------
+Ran 15 tests in 1.230s
+
+OK
+reference: /home/frank14f/CelerisLab/tests/validation/multigrid/cpu_reference.py API CPUREF-0.3
+sha256 bba2a06a9f6517b32079ffff15e4060d8c3b7ed35f16ca134e1877226c9e4e1e cpu_reference.py
+sha256 ade5d4827f971aed7174b59d83769e7aa542338e625a9fc8db1e8b1805cb74ca test_cpu_reference.py
+python 3.10.13 numpy 1.26.4 Linux-6.8.0-138-generic-x86_64-with-glibc2.35
+
+reference corner_links lists 8 uniquely keyed corner-pass links
+
+corner SRT symmetry values: {'LL': 0.02798201349283891, 'LR': 0.027982013492838912, 'UL': 0.02798201349283891, 'UR': 0.02798201349283891}
+
+[identity] leaf0=[255.98790565531962, 7.683069168222897, -5.122316610476732] leaf8=[255.98790565532028, 7.683069168222904, -5.122316610476715] drift=[6.536993168992922e-13, 7.105427357601002e-15, 1.687538997430238e-14]
+
+[identity] max |ref - independent| over 3 steps = 0.000e+00
+
+slots=100 (corner-pass 8), unique reads=400, max read multiplicity=1
+
+counts: coarse cells collided once=192, fine twice=256, ghost explosion writes=320; tick validation OK
+
+[srt] leaf0=[256.01002619890596, 7.680601714336587, -5.120130711410963] leaf8=[256.0100261989044, 7.680601714336586, -5.120130711410962] drift=[-1.5347723092418164e-12, -8.881784197001252e-16, 8.881784197001252e-16]
+
+[srt] max |ref - independent| over 3 steps = 2.776e-16
+
+[identity corner] expected=0.026777777777777775 got=0.026777777777777775; srt-expected differs by 1.204e-03
+
+[srt corner] expected=0.027982013492838916 got=0.02798201349283891 diff=-6.939e-18 (uncoalesced g8=0.028027777777777783)
+peak_rss_MiB 37.5
+
+RUN_RESULT {"test_script": "test_cpu_reference.py", "command": ["/usr/bin/prlimit", "--as=268435456", "--fsize=2097152", "--core=0", "--", "/home/frank14f/anaconda3/envs/pycuda_3_10/bin/python", "-B", "/home/frank14f/CelerisLab/tests/validation/multigrid/test_cpu_reference.py"], "returncode": 0, "elapsed_seconds": 1.4467838869895786, "cumulative_child_peak_rss_MiB": 37.5}
+
+COMMAND /usr/bin/prlimit --as=268435456 --fsize=2097152 --core=0 -- /home/frank14f/anaconda3/envs/pycuda_3_10/bin/python -B /home/frank14f/CelerisLab/tests/validation/multigrid/test_tron_additions.py
+test_eight_unique_keys_and_child_packets (__main__.TestCornerIndividualPackets) ... ok
+test_coalesce_paths_reconstructed_test_side (__main__.TestRetainedDiagnostics) ... ok
+test_hop2_mask_semantics (__main__.TestRetainedDiagnostics) ... ok
+test_srt_coarse_and_fine_nan_masks_equal (__main__.TestSRTNanMask) ... ok
+test_diagnostic_field_delta (__main__.TestV02V03FieldDelta)
+Compare top-level diagnostic keys and budget keys between v0.2 and v0.3. ... ok
+
+----------------------------------------------------------------------
+Ran 5 tests in 0.464s
+
+OK
+reference: /home/frank14f/CelerisLab/tests/validation/multigrid/cpu_reference.py API CPUREF-0.3
+sha256 bba2a06a9f6517b32079ffff15e4060d8c3b7ed35f16ca134e1877226c9e4e1e cpu_reference.py
+sha256 ade5d4827f971aed7174b59d83769e7aa542338e625a9fc8db1e8b1805cb74ca test_cpu_reference.py
+sha256 8e7a6a90b85e64c7326719e7b8bca2f6d34fb4c80690f0685f7e291ab93bd2a4 test_tron_additions.py
+python 3.10.13 numpy 1.26.4 Linux-6.8.0-138-generic-x86_64-with-glibc2.35
+
+[8 corner keys] ['lower_left_q7', 'lower_left_q8', 'lower_right_q5', 'lower_right_q6', 'upper_left_q5', 'upper_left_q6', 'upper_right_q7', 'upper_right_q8']; packets 3xg8+1xmid8, weights 0.25, avg=0.027982013492838916
+
+[coalesce_paths test-side] 100 rows x 4; hist={('corner_pass', 'A', 'I'): 8, ('corner_pass', 'I', 'I'): 24, ('face_or_diag_from_patch', 'A', 'A'): 180, ('face_or_diag_from_patch', 'I', 'A'): 188}
+
+[hop2_valid] matches independent derivation; valid inner=1060; reads hop2-valid=400
+
+[srt masks] coarse+fine NaN masks equal over 3 steps; max diff 2.776e-16
+
+[v0.2→v0.3 fields] removed=['coalesce_paths', 'explosion_count', 'fine_valid_after'] added=['hop2_valid']; budget rename closure_error→bookkeeping_check; corner_packets 4→8
+peak_rss_MiB 37.4609375
+
+RUN_RESULT {"test_script": "test_tron_additions.py", "command": ["/usr/bin/prlimit", "--as=268435456", "--fsize=2097152", "--core=0", "--", "/home/frank14f/anaconda3/envs/pycuda_3_10/bin/python", "-B", "/home/frank14f/CelerisLab/tests/validation/multigrid/test_tron_additions.py"], "returncode": 0, "elapsed_seconds": 0.677576785965357, "cumulative_child_peak_rss_MiB": 37.5}
+
+COMMAND /usr/bin/prlimit --as=268435456 --fsize=2097152 --core=0 -- /home/frank14f/anaconda3/envs/pycuda_3_10/bin/python -B /home/frank14f/CelerisLab/tests/validation/multigrid/test_open_corner_negative_control.py
+test_open_vs_closed (__main__.OpenCornerNegativeControl) ... ok
+
+----------------------------------------------------------------------
+Ran 1 test in 0.703s
+
+OK
+[identity] coalesce rows closed=100 open=92 dropped=8
+[identity] seed=1 steps=1 closed: max|leaf drift|=5.551e-17 max|interface_residual|=2.109e-15 | OPEN: max|leaf drift| (mass,mx,my)=(0.000e+00,5.551e-17,2.776e-17) max|interface_residual|=1.776e-15
+[identity] seed=1 steps=8 closed: max|leaf drift|=2.776e-16 max|interface_residual|=2.276e-15 | OPEN: max|leaf drift| (mass,mx,my)=(0.000e+00,2.220e-16,2.776e-16) max|interface_residual|=2.665e-15
+[identity] seed=2 steps=1 closed: max|leaf drift|=3.331e-16 max|interface_residual|=1.971e-15 | OPEN: max|leaf drift| (mass,mx,my)=(0.000e+00,1.665e-16,3.331e-16) max|interface_residual|=2.665e-15
+[identity] seed=2 steps=8 closed: max|leaf drift|=5.684e-14 max|interface_residual|=2.998e-15 | OPEN: max|leaf drift| (mass,mx,my)=(5.684e-14,2.220e-16,3.331e-16) max|interface_residual|=2.665e-15
+[srt] coalesce rows closed=100 open=92 dropped=8
+[srt] seed=1 steps=1 closed: max|leaf drift|=2.269e-14 max|interface_residual|=2.831e-15 | OPEN: max|leaf drift| (mass,mx,my)=(2.078e-03,8.560e-04,2.620e-04) max|interface_residual|=2.078e-03
+[srt] seed=1 steps=8 closed: max|leaf drift|=4.040e-14 max|interface_residual|=4.774e-15 | OPEN: max|leaf drift| (mass,mx,my)=(2.078e-03,8.560e-04,2.620e-04) max|interface_residual|=2.078e-03
+[srt] seed=2 steps=1 closed: max|leaf drift|=4.078e-14 max|interface_residual|=2.331e-15 | OPEN: max|leaf drift| (mass,mx,my)=(5.660e-04,2.359e-04,6.755e-04) max|interface_residual|=6.755e-04
+[srt] seed=2 steps=8 closed: max|leaf drift|=4.078e-14 max|interface_residual|=2.554e-15 | OPEN: max|leaf drift| (mass,mx,my)=(6.526e-04,5.767e-04,1.401e-03) max|interface_residual|=1.401e-03
+
+RUN_RESULT {"test_script": "test_open_corner_negative_control.py", "command": ["/usr/bin/prlimit", "--as=268435456", "--fsize=2097152", "--core=0", "--", "/home/frank14f/anaconda3/envs/pycuda_3_10/bin/python", "-B", "/home/frank14f/CelerisLab/tests/validation/multigrid/test_open_corner_negative_control.py"], "returncode": 0, "elapsed_seconds": 0.8977452759863809, "cumulative_child_peak_rss_MiB": 37.5}
@@ -0,0 +1,124 @@
+Local-stress observable v1 — Horsea review and single-run handoff
+2026-10-13, Asia/Shanghai. Observation-only; reference unchanged.
+
+Actual result
+Exactly one execution of the delivered script: 7 runs x 32 coarse steps, exit 0.
+Original 22 Boolean hard checks plus 7 stress-finite checks: all 29 pass.
+Both ALL_HARD_CHECKS_PASS_V02 and ALL_HARD_CHECKS_PASS_WITH_STRESS are True.
+No retries, added cases, modified formulas, relaxed tolerances or new R thresholds.
+
+Review status (separate from numerical results)
+Grok authored the implementation and ran it in an independent environment.
+The coordinating root reported an independent static review with no substantive
+issue. Claude's implementation-code review is paused due to an API error and
+has NOT completed. Claude's earlier specification discussion and the table's
+"implicit-definition checks" do not constitute a completed code review.
+Horsea read all 902 script lines, original stdout, table and manifest, reviewed
+the related reference paths and local reference sources below, and found no
+substantive numerical objection blocking this bounded diagnostic rerun.
+
+Scope and static review
+Applied .github/skills/lbm-ref-architecture-guard/SKILL.md and its reference/
+architecture checklists. No applicable ancestor AGENTS.md was found.
+The incoming script is standalone NumPy+stdlib, with no runtime dependency on
+the previous shear script. Its original bytes are preserved. Architecture:
+main -> run_uniform(B/C) / run_composite(A/A_T) -> arrival populations ->
+sigma_xy_cell -> level-specific sigma restriction -> Fourier R and profiles.
+The composite advance uses the existing CPUREF-0.3 API without wrapping or
+changing its algorithm. The external recorder pins the reference before import;
+the diagnostic's printed REF_SHA_MATCH alone would not enforce that pin.
+
+Reference findings (read-only, no imported reference packages)
+1. ref/lbmpy/src/lbmpy/macroscopic_value_kernels.py, strain_rate_tensor_getter:
+   the second moment is formed from f minus equilibrium; S=-3*omega*Pi/(2*rho).
+2. ref/OpenLB/src/functors/lattice/latticePhysStrainRate2D.hh independently uses
+   the negative nonequilibrium-moment sign and omega/(2*rho*cs^2*dt) conversion.
+3. ref/lbmpy/src/lbmpy/relaxationrates.py gives nu=(tau-.5)/3. Combining
+   sigma=2*rho*nu*S yields -(1-1/(2*tau))*Pi_neq in lattice units.
+4. ref/OpenLB/src/core/unitConverter.h converts viscosity by dx^2/dt and
+   pressure/stress by density*(dx/dt)^2. Here dx/dt=1 on both levels and density
+   units match, so no additional scale factor belongs in this observation.
+5. Existing cpu_reference.py: paired D2Q9 ordering, physical patch offset,
+   acoustic tau scaling, arrival_f input/output, tick increment 2, and owned
+   leaf-cell masks. The pinned full reference was reviewed in the prior round;
+   this review reread its maps, collision/explosion, leaf totals and advance path.
+
+Verified definitions
+Initialization remains equilibrium of the exact cell-average sine velocity,
+not exact cell averages of nonlinear f_eq. Fine coordinates include patch offset.
+All final observations use coarse step 32: composite arrival_f tick=64,
+uniform B after 64 collide-stream substeps and C after 32. No extra collision.
+Pi_xy^neq=sum(cx*cy*f)-rho*ux*uy is evaluated per owned cell. Each level applies
+its own tau to obtain sigma BEFORE 2x2 volume averaging. Covered coarse values
+and fine ghosts are excluded. Velocity restriction averages rho/j before u=j/rho.
+R uses a_u=(2/256)*sum(u*sin) from the same run and final arrival state, not an
+analytic decay amplitude. This raw Fourier coefficient includes the cell-average
+sinc factor; the old decay fit amplitude uses its sinc-normalized template.
+The cosine stress projection and velocity projection use a common 16x16 grid.
+Signed horizontal profiles average columns 4:12 and retain all 16 rows; rows
+3,4,11,12 flank the patch faces. The transposed case reports R only, no profile.
+
+Runtime evidence
+Existing Python 3.10.13 / NumPy 1.26.4, CPU only. run_once.py is a standalone
+stdlib recorder derived from the previous recorder; it does not execute or
+import the prior diagnostic. It checks all four delivered file hashes, the tar
+hash and reference hash before launch, and refuses existing logs/results.
+Parent and child both used /usr/bin/prlimit with soft=hard bounds:
+  --as=268435456 --fsize=2097152 --core=0
+Process-only OPENBLAS_NUM_THREADS=1, PYTHONDONTWRITEBYTECODE=1,
+PYTHONNOUSERSITE=1, PYTHONOPTIMIZE=0; PYTHONPATH is only the current multigrid
+directory. CPU_REFERENCE_PATH explicitly selects its cpu_reference.py.
+results_horsea.json and stdout_horsea.txt retain full argv, environment, cwd,
+preflight SHA values, versions, times, exit status and measured RSS.
+UTC start/end: 2026-10-13 06:01:08.222086 / 06:01:10.671541
+Local start/end: 14:01:08 / 14:01:10 Asia/Shanghai.
+Child elapsed 2.435032 s; peak RSS 38.41796875 MiB; parent peak 18.75 MiB.
+Combined stdout/stderr with recorder metadata: 17091 bytes, below 2 MiB.
+
+Grok and prior-result comparison
+comparison.json parses each of the 29 Boolean checks, the original 22 names,
+both all-pass markers, R values, ratios and every profile value. HARD CHECKS,
+STRESS FINITE CHECKS, SUMMARY_LINES and DECAY FITS blocks all match Grok
+exactly at printed precision. All recorded numeric differences are zero.
+The ten profile rows in SUMMARY_LINES contain 160 scalar entries total.
+Six current lambda values also match the prior local shear output at 8 decimal
+places (the precision emitted by this script). Prior 10-decimal values are
+retained in the comparison for provenance, not claimed freshly measured here.
+Full stdout hashes need not match across machines; paths, runtime and recorder
+metadata differ. Printed equality is not full-precision field equality.
+
+R at coarse step 32 (diagnostic only):
+  phi0:    A=1.011774619306 B=.998555854025 C=1.008383635570
+  phiPi/2: A=1.011850480751 B=.998555854025 C=1.008383635570
+  A_T:     1.011850480751
+
+Interpretation limits (separate from pass/fail checks)
+The retained transpose assertion covers u/rho, not stress. R_A_T agreeing with
+R_A at phiPi/2 is a reported observation, NOT a new stress-transpose hard test.
+Seven finite-stress checks do not establish local stress accuracy, convergence,
+interface stress-transfer correctness or any causal mechanism. One resolution,
+tau pair, patch and short window remain in scope. Composite conservation uses
+the reference leaf-total helper; this is not a new independent conservation
+oracle. Time-held ghosts and unscaled nonequilibrium transfer remain candidate,
+non-exhaustive explanations. No time-interpolated ghosts were implemented.
+
+Frozen state and handoff
+baseline.json froze HEAD, Git status and 292 old-file hashes, including all
+previous CPUREF/shear evidence. Its stated hash scope excludes the read-only
+ref tree, symlinks and bytecode. Final manifest.json verifies the frozen files,
+original inputs and reference, and lists new paths/bytes/SHA256; its own SHA is
+reported in the handoff. Only this evidence directory and the delivered
+local_stress_observable_v1.py were added. No production imports, GPU/solver
+runs, installs, environment/SSH/system changes, DynamisLab access, commit or push.
+Stopped here for joint acceptance; Claude code review remains outstanding.
+
+User authorization evidence, verbatim as relayed by the coordinating thread
+<transcript_evidence>
+assistant（Sentinel_65ef50edab8c819194404548b6b8e469）: 新增的局部剪切应力观测已在 Grok 那边跑通，但同步到 Horsea 又被拦住：审查把上次许可限定为那一份文件。
+
+你是否允许本轮 AMR 协作后续的代码、测试、日志和报告，经现有 SSH 同步到 Horsea，并只在 CelerisLab/tests/validation/multigrid 内审阅和运行小型 CPU 验证？包含这次新观测；每次仍限 256 MiB 内存、2 MiB 输出，不改环境或生产代码。
+user（Sentinel_d0d3a42b2c088191aa8aebc105fb1b27）: 允许，你用GPU验证都行
+</transcript_evidence>
+The coordinating instruction narrows this run to CPU observation-only. Future
+GPU work was not performed or specified here; this is not unrestricted remote
+operation authorization. Input transfer was already complete when received.
@@ -0,0 +1,56 @@
+# Local-stress observable v1 — R / ratio / profile table
+
+Spec: `18_local_stress_observable_spec_v1.md`  
+Reference: CPUREF-0.3 sha256 `bba2a06a9f6517b32079ffff15e4060d8c3b7ed35f16ca134e1877226c9e4e1e` (unchanged)  
+Script: `local_stress_observable_v1.py`  
+Stdout: `stdout_local_stress_observable_v1.txt`  
+Arrival: CPUREF `State.coarse_f` / `State.fine_f` at `phase='arrival_f'` tick=64 after 32 `advance_coarse_once`; uniforms use post-stream `f` after collide→stream.  
+Diagnostic values only — no thresholds or mechanism claim. φ probes phase structure only.
+
+## Hashes
+| file | sha256 |
+|------|--------|
+| local_stress_observable_v1.py | 0e2777990359a7cf2bb29884173b7b01de37c49bcf49e1f29fc59fe83d62b456 |
+| stdout_local_stress_observable_v1.txt | 6a826e5ad729ce45af6879a07a1c659d8b4a21403fde5b9c6d9696cc6a5b09d4 |
+| cpu_reference_v0.3.py | bba2a06a9f6517b32079ffff15e4060d8c3b7ed35f16ca134e1877226c9e4e1e |
+
+## Hard checks
+- ALL_HARD_CHECKS_PASS_V02 = True (22 Booleans, unchanged from shear v0.2)
+- ALL_HARD_CHECKS_PASS_WITH_STRESS = True (+7 finite stress-array checks)
+- runtime 0.77 s, CPU only, exit 0
+
+## Scalar R at coarse step 32
+
+| φ | R_A | R_B | R_C | R_A/R_B | R_A/R_C |
+|---|-----|-----|-----|--------|--------|
+| 0 | 1.011774619306 | 0.998555854025 | 1.008383635570 | 1.013237882716 | 1.003362791319 |
+| π/2 | 1.011850480751 | 0.998555854025 | 1.008383635570 | 1.013313853874 | 1.003438022057 |
+
+Transposed A (φ=π/2): R_A_T = 1.011850480751 (R only; no profile). Matches R_A at φ=π/2.
+
+## Signed horizontal-face profile s(j) (x-avg over columns [4,12), / ρ0 ν k a_u)
+
+Face rows flagged: j = 3, 4, 11, 12 (patch faces at y=4 and y=12).
+
+### φ = 0 — face rows
+| j | s_A | s_B | s_C | s_A−s_B | s_A−s_C |
+|---|-----|-----|-----|--------|--------|
+| 3 | 1.826885e-01 | 1.948086e-01 | 1.967259e-01 | -1.212007e-02 | -1.403738e-02 |
+| 4 | -2.146875e-01 | -1.948086e-01 | -1.967259e-01 | -1.987891e-02 | -1.796161e-02 |
+| 11 | -2.146875e-01 | -1.948086e-01 | -1.967259e-01 | -1.987891e-02 | -1.796161e-02 |
+| 12 | 1.826885e-01 | 1.948086e-01 | 1.967259e-01 | -1.212007e-02 | -1.403738e-02 |
+
+### φ = π/2 — face rows
+| j | s_A | s_B | s_C | s_A−s_B | s_A−s_C |
+|---|-----|-----|-----|--------|--------|
+| 3 | -1.003712e+00 | -9.793689e-01 | -9.890078e-01 | -2.434262e-02 | -1.470367e-02 |
+| 4 | -9.868392e-01 | -9.793689e-01 | -9.890078e-01 | -7.470343e-03 | 2.168600e-03 |
+| 11 | 9.868392e-01 | 9.793689e-01 | 9.890078e-01 | 7.470343e-03 | -2.168600e-03 |
+| 12 | 1.003712e+00 | 9.793689e-01 | 9.890078e-01 | 2.434262e-02 | 1.470367e-02 |
+
+Full 16-row profiles are in stdout `SUMMARY_LINES` / `PROFILE_*` blocks.
+
+## Implicit-definition checks (Claude's three)
+1. a_u = each run's own projected amplitude from the same arrival state — **yes** (not U0·e^{−νk²t}).
+2. Profile x-average over patch columns x∈[4,12) for A/B/C — **yes**.
+3. Transposed run reports R only, no profile — **yes**; R_A_T = R_A(φ=π/2).
@@ -0,0 +1,300 @@
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+      "sha256": "6a826e5ad729ce45af6879a07a1c659d8b4a21403fde5b9c6d9696cc6a5b09d4"
+    }
+  ]
+}
@@ -0,0 +1,73 @@
+{
+  "started_utc": "2026-10-13T06:01:08.222086+00:00",
+  "cwd": "/home/frank14f/CelerisLab/tests/validation/multigrid",
+  "parent_command": [
+    "env",
+    "OPENBLAS_NUM_THREADS=1",
+    "PYTHONDONTWRITEBYTECODE=1",
+    "PYTHONNOUSERSITE=1",
+    "PYTHONOPTIMIZE=0",
+    "PYTHONPATH=/home/frank14f/CelerisLab/tests/validation/multigrid",
+    "CPU_REFERENCE_PATH=/home/frank14f/CelerisLab/tests/validation/multigrid/cpu_reference.py",
+    "/usr/bin/prlimit",
+    "--as=268435456",
+    "--fsize=2097152",
+    "--core=0",
+    "--",
+    "/home/frank14f/anaconda3/envs/pycuda_3_10/bin/python",
+    "-B",
+    "/home/frank14f/CelerisLab/tests/validation/multigrid/local_stress_v1_evidence/run_once.py"
+  ],
+  "script_command": [
+    "/usr/bin/prlimit",
+    "--as=268435456",
+    "--fsize=2097152",
+    "--core=0",
+    "--",
+    "/home/frank14f/anaconda3/envs/pycuda_3_10/bin/python",
+    "-B",
+    "/home/frank14f/CelerisLab/tests/validation/multigrid/local_stress_observable_v1.py"
+  ],
+  "environment": {
+    "OPENBLAS_NUM_THREADS": "1",
+    "PYTHONDONTWRITEBYTECODE": "1",
+    "PYTHONNOUSERSITE": "1",
+    "PYTHONOPTIMIZE": "0",
+    "PYTHONPATH": "/home/frank14f/CelerisLab/tests/validation/multigrid",
+    "CPU_REFERENCE_PATH": "/home/frank14f/CelerisLab/tests/validation/multigrid/cpu_reference.py"
+  },
+  "python_version": "3.10.13 (main, Sep 11 2023, 13:44:35) [GCC 11.2.0]",
+  "numpy_version_from_installed_metadata": "1.26.4",
+  "platform": "Linux-6.8.0-138-generic-x86_64-with-glibc2.35",
+  "hard_limits": {
+    "address_space_bytes": [
+      268435456,
+      268435456
+    ],
+    "output_file_bytes": [
+      2097152,
+      2097152
+    ],
+    "core_bytes": [
+      0,
+      0
+    ]
+  },
+  "input_hashes_verified_before_execution": {
+    "local_stress_observable_v1.py": "0e2777990359a7cf2bb29884173b7b01de37c49bcf49e1f29fc59fe83d62b456",
+    "stdout_local_stress_observable_v1.txt": "6a826e5ad729ce45af6879a07a1c659d8b4a21403fde5b9c6d9696cc6a5b09d4",
+    "TABLE_local_stress_observable_v1.md": "d8ff0568d9c473a4bb09396a8948ddc8dc5af2f0f3a23ac84d238814fc779501",
+    "source_manifest.json": "d2cf90b73458f493c665c9a281d06aef0c190cf0d143639fb77ab838c78f020c"
+  },
+  "archive_sha256_verified_before_execution": "5834b23711496beb152188df5f47ff8175baf7e52543774401bd2c1183433eed",
+  "reference_sha256_verified_before_execution": "bba2a06a9f6517b32079ffff15e4060d8c3b7ed35f16ca134e1877226c9e4e1e",
+  "planned_runs": 7,
+  "coarse_steps_per_run": 32,
+  "attempt": 1,
+  "returncode": 0,
+  "elapsed_seconds": 2.435032418987248,
+  "child_peak_rss_MiB": 38.41796875,
+  "parent_peak_rss_MiB": 18.75,
+  "completed_utc": "2026-10-13T06:01:10.671541+00:00",
+  "stdout_bytes": 17091
+}
@@ -0,0 +1,84 @@
+"""Bounded execution recorder; refuses to overwrite evidence or repeat a run."""
+import datetime
+import hashlib
+import importlib.metadata
+import json
+import os
+from pathlib import Path
+import platform
+import resource
+import shlex
+import subprocess
+import sys
+import time
+
+evidence = Path(__file__).resolve().parent
+base = evidence.parent
+script = base / "local_stress_observable_v1.py"
+reference = base / "cpu_reference.py"
+expected_env = {
+    "OPENBLAS_NUM_THREADS": "1",
+    "PYTHONDONTWRITEBYTECODE": "1",
+    "PYTHONNOUSERSITE": "1",
+    "PYTHONOPTIMIZE": "0",
+    "PYTHONPATH": str(base),
+    "CPU_REFERENCE_PATH": str(reference),
+}
+limits = {
+    "address_space_bytes": (resource.RLIMIT_AS, 268435456),
+    "output_file_bytes": (resource.RLIMIT_FSIZE, 2097152),
+    "core_bytes": (resource.RLIMIT_CORE, 0),
+}
+assert all(os.environ.get(k) == v for k, v in expected_env.items())
+assert all(resource.getrlimit(key) == (value, value) for key, value in limits.values())
+assert sys.executable == "/home/frank14f/anaconda3/envs/pycuda_3_10/bin/python"
+assert hashlib.sha256(script.read_bytes()).hexdigest() == "0e2777990359a7cf2bb29884173b7b01de37c49bcf49e1f29fc59fe83d62b456"
+assert hashlib.sha256(reference.read_bytes()).hexdigest() == "bba2a06a9f6517b32079ffff15e4060d8c3b7ed35f16ca134e1877226c9e4e1e"
+input_hashes = {'local_stress_observable_v1.py': '0e2777990359a7cf2bb29884173b7b01de37c49bcf49e1f29fc59fe83d62b456', 'stdout_local_stress_observable_v1.txt': '6a826e5ad729ce45af6879a07a1c659d8b4a21403fde5b9c6d9696cc6a5b09d4', 'TABLE_local_stress_observable_v1.md': 'd8ff0568d9c473a4bb09396a8948ddc8dc5af2f0f3a23ac84d238814fc779501', 'source_manifest.json': 'd2cf90b73458f493c665c9a281d06aef0c190cf0d143639fb77ab838c78f020c'}
+for name, digest in input_hashes.items():
+    path = (base if name.endswith(".py") else evidence) / name
+    assert hashlib.sha256(path.read_bytes()).hexdigest() == digest, name
+archive_path = Path("/tmp/celerislab-local-stress-input-20261013-0e277799.tar")
+archive_sha = "5834b23711496beb152188df5f47ff8175baf7e52543774401bd2c1183433eed"
+assert hashlib.sha256(archive_path.read_bytes()).hexdigest() == archive_sha
+log_path = evidence / "stdout_horsea.txt"
+result_path = evidence / "results_horsea.json"
+assert not log_path.exists() and not result_path.exists(), "Existing execution evidence; do not rerun"
+prefix = ["/usr/bin/prlimit", "--as=268435456", "--fsize=2097152", "--core=0", "--", sys.executable, "-B"]
+command = prefix + [str(script)]
+report = {
+    "started_utc": datetime.datetime.now(datetime.timezone.utc).isoformat(),
+    "cwd": str(base),
+    "parent_command": ["env"] + [f"{k}={v}" for k, v in expected_env.items()] + prefix + [str(Path(__file__).resolve())],
+    "script_command": command,
+    "environment": expected_env,
+    "python_version": sys.version,
+    "numpy_version_from_installed_metadata": importlib.metadata.version("numpy"),
+    "platform": platform.platform(),
+    "hard_limits": {name: resource.getrlimit(key) for name, (key, _) in limits.items()},
+    "input_hashes_verified_before_execution": input_hashes,
+    "archive_sha256_verified_before_execution": archive_sha,
+    "reference_sha256_verified_before_execution": hashlib.sha256(reference.read_bytes()).hexdigest(),
+    "planned_runs": 7,
+    "coarse_steps_per_run": 32,
+    "attempt": 1,
+}
+with log_path.open("xb", buffering=0) as log:
+    log.write(("RECORDER " + json.dumps(report) + "\nCOMMAND " + shlex.join(command) + "\n").encode())
+    start = time.monotonic()
+    child = subprocess.run(command, cwd=base, stdout=log, stderr=subprocess.STDOUT, check=False)
+    report.update(
+        returncode=child.returncode,
+        elapsed_seconds=time.monotonic() - start,
+        child_peak_rss_MiB=resource.getrusage(resource.RUSAGE_CHILDREN).ru_maxrss / 1024,
+        parent_peak_rss_MiB=resource.getrusage(resource.RUSAGE_SELF).ru_maxrss / 1024,
+        completed_utc=datetime.datetime.now(datetime.timezone.utc).isoformat(),
+    )
+    log.write(("\nRUN_RESULT " + json.dumps(report) + "\n").encode())
+report["stdout_bytes"] = log_path.stat().st_size
+with result_path.open("x") as result:
+    json.dump(report, result, indent=2)
+    result.write("\n")
+print(json.dumps(report, indent=2))
+assert report["stdout_bytes"] < 2097152
+sys.exit(child.returncode if child.returncode >= 0 else 1)
@@ -0,0 +1,20 @@
+[
+  {
+    "id": "1EBdGY3CxGm_uwCZ_L9vv3q6UgDoH01pM",
+    "name": "local_stress_observable_v1.py",
+    "bytes": 32574,
+    "sha256": "0e2777990359a7cf2bb29884173b7b01de37c49bcf49e1f29fc59fe83d62b456"
+  },
+  {
+    "id": "1TpMS9MfWP3gnouHJ95MQ_lozKMPbgTSH",
+    "name": "stdout_local_stress_observable_v1.txt",
+    "bytes": 12238,
+    "sha256": "6a826e5ad729ce45af6879a07a1c659d8b4a21403fde5b9c6d9696cc6a5b09d4"
+  },
+  {
+    "id": "1l1HljRJEcCrJNgSGdWSdQ7OOvEjdRXqi",
+    "name": "TABLE_local_stress_observable_v1.md",
+    "bytes": 2967,
+    "sha256": "d8ff0568d9c473a4bb09396a8948ddc8dc5af2f0f3a23ac84d238814fc779501"
+  }
+]
@@ -0,0 +1,122 @@
+RECORDER {"started_utc": "2026-10-13T06:01:08.222086+00:00", "cwd": "/home/frank14f/CelerisLab/tests/validation/multigrid", "parent_command": ["env", "OPENBLAS_NUM_THREADS=1", "PYTHONDONTWRITEBYTECODE=1", "PYTHONNOUSERSITE=1", "PYTHONOPTIMIZE=0", "PYTHONPATH=/home/frank14f/CelerisLab/tests/validation/multigrid", "CPU_REFERENCE_PATH=/home/frank14f/CelerisLab/tests/validation/multigrid/cpu_reference.py", "/usr/bin/prlimit", "--as=268435456", "--fsize=2097152", "--core=0", "--", "/home/frank14f/anaconda3/envs/pycuda_3_10/bin/python", "-B", "/home/frank14f/CelerisLab/tests/validation/multigrid/local_stress_v1_evidence/run_once.py"], "script_command": ["/usr/bin/prlimit", "--as=268435456", "--fsize=2097152", "--core=0", "--", "/home/frank14f/anaconda3/envs/pycuda_3_10/bin/python", "-B", "/home/frank14f/CelerisLab/tests/validation/multigrid/local_stress_observable_v1.py"], "environment": {"OPENBLAS_NUM_THREADS": "1", "PYTHONDONTWRITEBYTECODE": "1", "PYTHONNOUSERSITE": "1", "PYTHONOPTIMIZE": "0", "PYTHONPATH": "/home/frank14f/CelerisLab/tests/validation/multigrid", "CPU_REFERENCE_PATH": "/home/frank14f/CelerisLab/tests/validation/multigrid/cpu_reference.py"}, "python_version": "3.10.13 (main, Sep 11 2023, 13:44:35) [GCC 11.2.0]", "numpy_version_from_installed_metadata": "1.26.4", "platform": "Linux-6.8.0-138-generic-x86_64-with-glibc2.35", "hard_limits": {"address_space_bytes": [268435456, 268435456], "output_file_bytes": [2097152, 2097152], "core_bytes": [0, 0]}, "input_hashes_verified_before_execution": {"local_stress_observable_v1.py": "0e2777990359a7cf2bb29884173b7b01de37c49bcf49e1f29fc59fe83d62b456", "stdout_local_stress_observable_v1.txt": "6a826e5ad729ce45af6879a07a1c659d8b4a21403fde5b9c6d9696cc6a5b09d4", "TABLE_local_stress_observable_v1.md": "d8ff0568d9c473a4bb09396a8948ddc8dc5af2f0f3a23ac84d238814fc779501", "source_manifest.json": "d2cf90b73458f493c665c9a281d06aef0c190cf0d143639fb77ab838c78f020c"}, "archive_sha256_verified_before_execution": "5834b23711496beb152188df5f47ff8175baf7e52543774401bd2c1183433eed", "reference_sha256_verified_before_execution": "bba2a06a9f6517b32079ffff15e4060d8c3b7ed35f16ca134e1877226c9e4e1e", "planned_runs": 7, "coarse_steps_per_run": 32, "attempt": 1}
+COMMAND /usr/bin/prlimit --as=268435456 --fsize=2097152 --core=0 -- /home/frank14f/anaconda3/envs/pycuda_3_10/bin/python -B /home/frank14f/CelerisLab/tests/validation/multigrid/local_stress_observable_v1.py
+=== local_stress_observable_v1 against CPUREF-0.3 ===
+REF_PATH=/home/frank14f/CelerisLab/tests/validation/multigrid/cpu_reference.py
+REF_SHA256=bba2a06a9f6517b32079ffff15e4060d8c3b7ed35f16ca134e1877226c9e4e1e
+REF_SHA_MATCH=True
+API_VERSION=CPUREF-0.3
+U0=0.001 tau_c=0.8 tau_f=1.1 steps=32 nu=0.1 k=0.39269908169872414
+nu*k^2=0.01542126
+ARRIVAL_STATE_POLICY: read CPUREF-0.3 State.coarse_f/fine_f at phase='arrival_f'
+  after N advance_coarse_once calls (tick=2N). That array IS post-stream pre-collision.
+  Uniform B/C use local collide-then-stream; f after 2N (B) or N (C) streams is arrival.
+  If arrival were unreachable without changing the reference, this script would STOP.
+STRESS: Pi_neq=sum(cx*cy*f)-rho*ux*uy; sigma=-(1-1/(2*tau))*Pi_neq; 2x2 vol-avg of sigma.
+  No extra dx/dt factor. a_u=(2/256)sum u sin; P_sigma=(2/256)sum sigma cos; own a_u.
+  Profile s(j)=mean_x[4,12)(sigma)/ (rho0*nu*k*a_u). Transposed: R only, no profile.
+
+-- running C (uniform-coarse) phi0.0000
+  ARRIVAL_ARRAY: uniform_C_f_after_32_stream_steps_(=coarse_step_32_arrival; collide-then-stream loop)
+-- running B (uniform-fine) phi0.0000
+  ARRIVAL_ARRAY: uniform_B_f_after_64_stream_steps_(=coarse_step_32_arrival; collide-then-stream loop)
+-- running A (composite CPUREF) phi0.0000
+  ARRIVAL_ARRAY: State.coarse_f + State.fine_f at phase='arrival_f' tick=64 (after 32 advance_coarse_once; arrival_f = post-stream pre-collision)
+  state.phase=arrival_f state.tick=64
+-- running C (uniform-coarse) phi1.5708
+  ARRIVAL_ARRAY: uniform_C_f_after_32_stream_steps_(=coarse_step_32_arrival; collide-then-stream loop)
+-- running B (uniform-fine) phi1.5708
+  ARRIVAL_ARRAY: uniform_B_f_after_64_stream_steps_(=coarse_step_32_arrival; collide-then-stream loop)
+-- running A (composite CPUREF) phi1.5708
+  ARRIVAL_ARRAY: State.coarse_f + State.fine_f at phase='arrival_f' tick=64 (after 32 advance_coarse_once; arrival_f = post-stream pre-collision)
+  state.phase=arrival_f state.tick=64
+-- running A transpose phi=1.5707963267948966
+  ARRIVAL_ARRAY: State.coarse_f + State.fine_f at phase='arrival_f' tick=64 (after 32 advance_coarse_once; arrival_f = post-stream pre-collision)
+
+=== HARD CHECKS (unchanged v0.2 set) ===
+  finite[A_phi0.0000]=True cons=True mass_drift=5.969e-13 momx_drift=1.690e-13 momy_drift=2.753e-14 tol_abs=2.560e-10 init_rho_j_mismatch_vs_coarse_formula=1.110e-16
+  finite[B_phi0.0000]=True cons=True mass_drift=7.105e-13 momx_drift=2.970e-15 momy_drift=3.553e-15 tol_abs=2.560e-10 
+  finite[C_phi0.0000]=True cons=True mass_drift=4.547e-13 momx_drift=4.607e-15 momy_drift=6.495e-15 tol_abs=2.560e-10 
+  finite[A_phi1.5708]=True cons=True mass_drift=8.242e-13 momx_drift=1.033e-13 momy_drift=9.015e-14 tol_abs=2.560e-10 init_rho_j_mismatch_vs_coarse_formula=1.110e-16
+  finite[B_phi1.5708]=True cons=True mass_drift=6.821e-13 momx_drift=2.970e-15 momy_drift=3.553e-15 tol_abs=2.560e-10 
+  finite[C_phi1.5708]=True cons=True mass_drift=4.547e-13 momx_drift=4.607e-15 momy_drift=6.495e-15 tol_abs=2.560e-10 
+  finite[A_T_phi1.5708]=True cons=True mass_drift=7.105e-13 momx_drift=1.843e-14 momy_drift=6.062e-14 tol_abs=2.560e-10 init_rho_j_mismatch_vs_coarse_formula=1.110e-16
+  transpose_ok=True max_err=6.661e-16 (tol=1.000e-15)
+  t0 phi0.0000: AB_patch=1.084e-19 ok=True AC_out=2.168e-19 ok=True init_mm=1.110e-16 ok=True
+  t0 phi1.5708: AB_patch=1.084e-19 ok=True AC_out=2.168e-19 ok=True init_mm=1.110e-16 ok=True
+  init_mismatch[A_T]=1.110e-16 ok=True
+
+=== STRESS FINITE CHECKS (addition) ===
+  stress_finite[C_phi0.0000]=True R=1.00838364 a_u=5.991310e-04 P_sigma=2.372507e-05
+  stress_finite[B_phi0.0000]=True R=0.99855585 a_u=6.078606e-04 P_sigma=2.383616e-05
+  stress_finite[A_phi0.0000]=True R=1.01177462 a_u=5.949025e-04 P_sigma=2.363684e-05
+  stress_finite[C_phi1.5708]=True R=1.00838364 a_u=5.991310e-04 P_sigma=2.372507e-05
+  stress_finite[B_phi1.5708]=True R=0.99855585 a_u=6.078606e-04 P_sigma=2.383616e-05
+  stress_finite[A_phi1.5708]=True R=1.01185048 a_u=5.950623e-04 P_sigma=2.364496e-05
+  stress_finite[A_T_phi1.5708]=True R=1.01185048 a_u=5.950623e-04 P_sigma=2.364496e-05
+  N_BOOLEAN_HARD_CHECKS_V02=22: cons_A_T_phi1.5708,cons_A_phi0.0000,cons_A_phi1.5708,cons_B_phi0.0000,cons_B_phi1.5708,cons_C_phi0.0000,cons_C_phi1.5708,finite_A_T_phi1.5708,finite_A_phi0.0000,finite_A_phi1.5708,finite_B_phi0.0000,finite_B_phi1.5708,finite_C_phi0.0000,finite_C_phi1.5708,init_mismatch_ok_A_T_phi1.5708,init_mismatch_ok_phi0.0000,init_mismatch_ok_phi1.5708,t0_AB_patch_ok_phi0.0000,t0_AB_patch_ok_phi1.5708,t0_AC_out_ok_phi0.0000,t0_AC_out_ok_phi1.5708,transpose_ok
+  N_BOOLEAN_HARD_CHECKS_WITH_STRESS=29
+
+=== LOCAL STRESS OBSERVABLE at coarse step 32 ===
+FORMULA: R = P_sigma / (rho0 * nu * k * a_u); a_u from SAME run/tick/arrival
+WORDING: reported diagnostics only; phi probes phase structure only; no mechanism claim
+
+-- phi0.0000 --
+  R_A=1.0117746193  R_B=0.9985558540  R_C=1.0083836356
+  R_A/R_B=1.0132378827  R_A/R_C=1.0033627913
+  a_u A/B/C: 5.94902468e-04 6.07860566e-04 5.99130994e-04
+  P_sigma A/B/C: 2.36368412e-05 2.38361559e-05 2.37250678e-05
+  s_A(j): 9.915595e-01 8.382231e-01 5.539374e-01 1.826885e-01 -2.146875e-01 -5.725265e-01 -8.489390e-01 -9.987898e-01 -9.987898e-01 -8.489390e-01 -5.725265e-01 -2.146875e-01 1.826885e-01 5.539374e-01 8.382231e-01 9.915595e-01
+  s_B(j): 9.793689e-01 8.302688e-01 5.547679e-01 1.948086e-01 -1.948086e-01 -5.547679e-01 -8.302688e-01 -9.793689e-01 -9.793689e-01 -8.302688e-01 -5.547679e-01 -1.948086e-01 1.948086e-01 5.547679e-01 8.302688e-01 9.793689e-01
+  s_C(j): 9.890078e-01 8.384404e-01 5.602279e-01 1.967259e-01 -1.967259e-01 -5.602279e-01 -8.384404e-01 -9.890078e-01 -9.890078e-01 -8.384404e-01 -5.602279e-01 -1.967259e-01 1.967259e-01 5.602279e-01 8.384404e-01 9.890078e-01
+  s_A-s_B: 1.219061e-02 7.954261e-03 -8.305464e-04 -1.212007e-02 -1.987891e-02 -1.775863e-02 -1.867018e-02 -1.942089e-02 -1.942089e-02 -1.867018e-02 -1.775863e-02 -1.987891e-02 -1.212007e-02 -8.305464e-04 7.954261e-03 1.219061e-02
+  s_A-s_C: 2.551668e-03 -2.172403e-04 -6.290569e-03 -1.403738e-02 -1.796161e-02 -1.229861e-02 -1.049868e-02 -9.781945e-03 -9.781945e-03 -1.049868e-02 -1.229861e-02 -1.796161e-02 -1.403738e-02 -6.290569e-03 -2.172403e-04 2.551668e-03
+  FACE_ROWS j=3,4,11,12 flagged: j3:A=1.82689e-01,B=1.94809e-01,C=1.96726e-01,A-B=-1.21201e-02,A-C=-1.40374e-02 j4:A=-2.14687e-01,B=-1.94809e-01,C=-1.96726e-01,A-B=-1.98789e-02,A-C=-1.79616e-02 j11:A=-2.14687e-01,B=-1.94809e-01,C=-1.96726e-01,A-B=-1.98789e-02,A-C=-1.79616e-02 j12:A=1.82689e-01,B=1.94809e-01,C=1.96726e-01,A-B=-1.21201e-02,A-C=-1.40374e-02
+
+-- phi1.5708 --
+  R_A=1.0118504808  R_B=0.9985558540  R_C=1.0083836356
+  R_A/R_B=1.0133138539  R_A/R_C=1.0034380221
+  a_u A/B/C: 5.95062313e-04 6.07860566e-04 5.99130994e-04
+  P_sigma A/B/C: 2.36449649e-05 2.38361559e-05 2.37250678e-05
+  s_A(j): -1.994357e-01 -5.681758e-01 -8.528746e-01 -1.003712e+00 -9.868392e-01 -8.333476e-01 -5.581768e-01 -1.961536e-01 1.961536e-01 5.581768e-01 8.333476e-01 9.868392e-01 1.003712e+00 8.528746e-01 5.681758e-01 1.994357e-01
+  s_B(j): -1.948086e-01 -5.547679e-01 -8.302688e-01 -9.793689e-01 -9.793689e-01 -8.302688e-01 -5.547679e-01 -1.948086e-01 1.948086e-01 5.547679e-01 8.302688e-01 9.793689e-01 9.793689e-01 8.302688e-01 5.547679e-01 1.948086e-01
+  s_C(j): -1.967259e-01 -5.602279e-01 -8.384404e-01 -9.890078e-01 -9.890078e-01 -8.384404e-01 -5.602279e-01 -1.967259e-01 1.967259e-01 5.602279e-01 8.384404e-01 9.890078e-01 9.890078e-01 8.384404e-01 5.602279e-01 1.967259e-01
+  s_A-s_B: -4.627099e-03 -1.340791e-02 -2.260573e-02 -2.434262e-02 -7.470343e-03 -3.078759e-03 -3.408852e-03 -1.344997e-03 1.344997e-03 3.408852e-03 3.078759e-03 7.470343e-03 2.434262e-02 2.260573e-02 1.340791e-02 4.627099e-03
+  s_A-s_C: -2.709794e-03 -7.947886e-03 -1.443423e-02 -1.470367e-02 2.168600e-03 5.092742e-03 2.051171e-03 5.723084e-04 -5.723084e-04 -2.051171e-03 -5.092742e-03 -2.168600e-03 1.470367e-02 1.443423e-02 7.947886e-03 2.709794e-03
+  FACE_ROWS j=3,4,11,12 flagged: j3:A=-1.00371e+00,B=-9.79369e-01,C=-9.89008e-01,A-B=-2.43426e-02,A-C=-1.47037e-02 j4:A=-9.86839e-01,B=-9.79369e-01,C=-9.89008e-01,A-B=-7.47034e-03,A-C=2.16860e-03 j11:A=9.86839e-01,B=9.79369e-01,C=9.89008e-01,A-B=7.47034e-03,A-C=-2.16860e-03 j12:A=1.00371e+00,B=9.79369e-01,C=9.89008e-01,A-B=2.43426e-02,A-C=1.47037e-02
+
+-- A_T phi=1.5708 (R only, no profile) --
+  R_A_T=1.0118504808  a_u=5.95062313e-04  P_sigma=2.36449649e-05
+  profile=None (transpose)
+
+=== DECAY FITS (informational; same as v0.2) ===
+  analytic lambda = 0.01542126
+  A phi0.0000: lambda=0.01585222 stderr=8.572e-08 R2=1.000000 A0=1.000000e-03 A32=5.987423e-04
+  B phi0.0000: lambda=0.01539917 stderr=3.372e-15 R2=1.000000 A0=1.000000e-03 A32=6.117840e-04
+  C phi0.0000: lambda=0.01554973 stderr=1.906e-08 R2=1.000000 A0=1.000000e-03 A32=6.029981e-04
+  A phi1.5708: lambda=0.01584192 stderr=2.131e-07 R2=1.000000 A0=1.000000e-03 A32=5.989032e-04
+  B phi1.5708: lambda=0.01539917 stderr=3.372e-15 R2=1.000000 A0=1.000000e-03 A32=6.117840e-04
+  C phi1.5708: lambda=0.01554973 stderr=1.906e-08 R2=1.000000 A0=1.000000e-03 A32=6.029981e-04
+
+=== NUMERIC SUMMARY ===
+ALL_HARD_CHECKS_PASS_V02=True
+ALL_HARD_CHECKS_PASS_WITH_STRESS=True
+runtime_sec=2.26
+SUMMARY_LINES_BEGIN
+R phi0.0000 A=1.011774619306 B=0.998555854025 C=1.008383635570 A/B=1.013237882716 A/C=1.003362791319
+PROFILE_A phi0.0000 9.91559495e-01 8.38223110e-01 5.53937362e-01 1.82688509e-01 -2.14687493e-01 -5.72526539e-01 -8.48939033e-01 -9.98789772e-01 -9.98789772e-01 -8.48939033e-01 -5.72526539e-01 -2.14687493e-01 1.82688509e-01 5.53937362e-01 8.38223110e-01 9.91559495e-01
+PROFILE_B phi0.0000 9.79368883e-01 8.30268849e-01 5.54767909e-01 1.94808583e-01 -1.94808583e-01 -5.54767909e-01 -8.30268849e-01 -9.79368883e-01 -9.79368883e-01 -8.30268849e-01 -5.54767909e-01 -1.94808583e-01 1.94808583e-01 5.54767909e-01 8.30268849e-01 9.79368883e-01
+PROFILE_C phi0.0000 9.89007827e-01 8.38440351e-01 5.60227931e-01 1.96725888e-01 -1.96725888e-01 -5.60227931e-01 -8.38440351e-01 -9.89007827e-01 -9.89007827e-01 -8.38440351e-01 -5.60227931e-01 -1.96725888e-01 1.96725888e-01 5.60227931e-01 8.38440351e-01 9.89007827e-01
+PROFILE_A-B phi0.0000 1.21906117e-02 7.95426140e-03 -8.30546408e-04 -1.21200743e-02 -1.98789102e-02 -1.77586304e-02 -1.86701838e-02 -1.94208889e-02 -1.94208889e-02 -1.86701838e-02 -1.77586304e-02 -1.98789102e-02 -1.21200743e-02 -8.30546408e-04 7.95426140e-03 1.21906117e-02
+PROFILE_A-C phi0.0000 2.55166826e-03 -2.17240307e-04 -6.29056929e-03 -1.40373794e-02 -1.79616052e-02 -1.22986075e-02 -1.04986821e-02 -9.78194544e-03 -9.78194544e-03 -1.04986821e-02 -1.22986075e-02 -1.79616052e-02 -1.40373794e-02 -6.29056929e-03 -2.17240307e-04 2.55166826e-03
+R phi1.5708 A=1.011850480751 B=0.998555854025 C=1.008383635570 A/B=1.013313853874 A/C=1.003438022057
+PROFILE_A phi1.5708 -1.99435683e-01 -5.68175817e-01 -8.52874579e-01 -1.00371150e+00 -9.86839227e-01 -8.33347608e-01 -5.58176761e-01 -1.96153580e-01 1.96153580e-01 5.58176761e-01 8.33347608e-01 9.86839227e-01 1.00371150e+00 8.52874579e-01 5.68175817e-01 1.99435683e-01
+PROFILE_B phi1.5708 -1.94808583e-01 -5.54767909e-01 -8.30268849e-01 -9.79368883e-01 -9.79368883e-01 -8.30268849e-01 -5.54767909e-01 -1.94808583e-01 1.94808583e-01 5.54767909e-01 8.30268849e-01 9.79368883e-01 9.79368883e-01 8.30268849e-01 5.54767909e-01 1.94808583e-01
+PROFILE_C phi1.5708 -1.96725888e-01 -5.60227931e-01 -8.38440351e-01 -9.89007827e-01 -9.89007827e-01 -8.38440351e-01 -5.60227931e-01 -1.96725888e-01 1.96725888e-01 5.60227931e-01 8.38440351e-01 9.89007827e-01 9.89007827e-01 8.38440351e-01 5.60227931e-01 1.96725888e-01
+PROFILE_A-B phi1.5708 -4.62709942e-03 -1.34079086e-02 -2.26057300e-02 -2.43426175e-02 -7.47034346e-03 -3.07875936e-03 -3.40885205e-03 -1.34499672e-03 1.34499672e-03 3.40885205e-03 3.07875936e-03 7.47034346e-03 2.43426175e-02 2.26057300e-02 1.34079086e-02 4.62709942e-03
+PROFILE_A-C phi1.5708 -2.70979435e-03 -7.94788568e-03 -1.44342283e-02 -1.47036740e-02 2.16860001e-03 5.09274236e-03 2.05117083e-03 5.72308350e-04 -5.72308350e-04 -2.05117083e-03 -5.09274236e-03 -2.16860001e-03 1.47036740e-02 1.44342283e-02 7.94788568e-03 2.70979435e-03
+R A_T_phi1.5708 R=1.011850480751
+TRANSPOSE err=6.661338e-16 ok=True
+REF_SHA256=bba2a06a9f6517b32079ffff15e4060d8c3b7ed35f16ca134e1877226c9e4e1e
+SUMMARY_LINES_END
+
+RUN_RESULT {"started_utc": "2026-10-13T06:01:08.222086+00:00", "cwd": "/home/frank14f/CelerisLab/tests/validation/multigrid", "parent_command": ["env", "OPENBLAS_NUM_THREADS=1", "PYTHONDONTWRITEBYTECODE=1", "PYTHONNOUSERSITE=1", "PYTHONOPTIMIZE=0", "PYTHONPATH=/home/frank14f/CelerisLab/tests/validation/multigrid", "CPU_REFERENCE_PATH=/home/frank14f/CelerisLab/tests/validation/multigrid/cpu_reference.py", "/usr/bin/prlimit", "--as=268435456", "--fsize=2097152", "--core=0", "--", "/home/frank14f/anaconda3/envs/pycuda_3_10/bin/python", "-B", "/home/frank14f/CelerisLab/tests/validation/multigrid/local_stress_v1_evidence/run_once.py"], "script_command": ["/usr/bin/prlimit", "--as=268435456", "--fsize=2097152", "--core=0", "--", "/home/frank14f/anaconda3/envs/pycuda_3_10/bin/python", "-B", "/home/frank14f/CelerisLab/tests/validation/multigrid/local_stress_observable_v1.py"], "environment": {"OPENBLAS_NUM_THREADS": "1", "PYTHONDONTWRITEBYTECODE": "1", "PYTHONNOUSERSITE": "1", "PYTHONOPTIMIZE": "0", "PYTHONPATH": "/home/frank14f/CelerisLab/tests/validation/multigrid", "CPU_REFERENCE_PATH": "/home/frank14f/CelerisLab/tests/validation/multigrid/cpu_reference.py"}, "python_version": "3.10.13 (main, Sep 11 2023, 13:44:35) [GCC 11.2.0]", "numpy_version_from_installed_metadata": "1.26.4", "platform": "Linux-6.8.0-138-generic-x86_64-with-glibc2.35", "hard_limits": {"address_space_bytes": [268435456, 268435456], "output_file_bytes": [2097152, 2097152], "core_bytes": [0, 0]}, "input_hashes_verified_before_execution": {"local_stress_observable_v1.py": "0e2777990359a7cf2bb29884173b7b01de37c49bcf49e1f29fc59fe83d62b456", "stdout_local_stress_observable_v1.txt": "6a826e5ad729ce45af6879a07a1c659d8b4a21403fde5b9c6d9696cc6a5b09d4", "TABLE_local_stress_observable_v1.md": "d8ff0568d9c473a4bb09396a8948ddc8dc5af2f0f3a23ac84d238814fc779501", "source_manifest.json": "d2cf90b73458f493c665c9a281d06aef0c190cf0d143639fb77ab838c78f020c"}, "archive_sha256_verified_before_execution": "5834b23711496beb152188df5f47ff8175baf7e52543774401bd2c1183433eed", "reference_sha256_verified_before_execution": "bba2a06a9f6517b32079ffff15e4060d8c3b7ed35f16ca134e1877226c9e4e1e", "planned_runs": 7, "coarse_steps_per_run": 32, "attempt": 1, "returncode": 0, "elapsed_seconds": 2.435032418987248, "child_peak_rss_MiB": 38.41796875, "parent_peak_rss_MiB": 18.75, "completed_utc": "2026-10-13T06:01:10.671541+00:00"}
@@ -0,0 +1,118 @@
+=== local_stress_observable_v1 against CPUREF-0.3 ===
+REF_PATH=/workspace/shear_diag/cpu_reference_v0.3.py
+REF_SHA256=bba2a06a9f6517b32079ffff15e4060d8c3b7ed35f16ca134e1877226c9e4e1e
+REF_SHA_MATCH=True
+API_VERSION=CPUREF-0.3
+U0=0.001 tau_c=0.8 tau_f=1.1 steps=32 nu=0.1 k=0.39269908169872414
+nu*k^2=0.01542126
+ARRIVAL_STATE_POLICY: read CPUREF-0.3 State.coarse_f/fine_f at phase='arrival_f'
+  after N advance_coarse_once calls (tick=2N). That array IS post-stream pre-collision.
+  Uniform B/C use local collide-then-stream; f after 2N (B) or N (C) streams is arrival.
+  If arrival were unreachable without changing the reference, this script would STOP.
+STRESS: Pi_neq=sum(cx*cy*f)-rho*ux*uy; sigma=-(1-1/(2*tau))*Pi_neq; 2x2 vol-avg of sigma.
+  No extra dx/dt factor. a_u=(2/256)sum u sin; P_sigma=(2/256)sum sigma cos; own a_u.
+  Profile s(j)=mean_x[4,12)(sigma)/ (rho0*nu*k*a_u). Transposed: R only, no profile.
+
+-- running C (uniform-coarse) phi0.0000
+  ARRIVAL_ARRAY: uniform_C_f_after_32_stream_steps_(=coarse_step_32_arrival; collide-then-stream loop)
+-- running B (uniform-fine) phi0.0000
+  ARRIVAL_ARRAY: uniform_B_f_after_64_stream_steps_(=coarse_step_32_arrival; collide-then-stream loop)
+-- running A (composite CPUREF) phi0.0000
+  ARRIVAL_ARRAY: State.coarse_f + State.fine_f at phase='arrival_f' tick=64 (after 32 advance_coarse_once; arrival_f = post-stream pre-collision)
+  state.phase=arrival_f state.tick=64
+-- running C (uniform-coarse) phi1.5708
+  ARRIVAL_ARRAY: uniform_C_f_after_32_stream_steps_(=coarse_step_32_arrival; collide-then-stream loop)
+-- running B (uniform-fine) phi1.5708
+  ARRIVAL_ARRAY: uniform_B_f_after_64_stream_steps_(=coarse_step_32_arrival; collide-then-stream loop)
+-- running A (composite CPUREF) phi1.5708
+  ARRIVAL_ARRAY: State.coarse_f + State.fine_f at phase='arrival_f' tick=64 (after 32 advance_coarse_once; arrival_f = post-stream pre-collision)
+  state.phase=arrival_f state.tick=64
+-- running A transpose phi=1.5707963267948966
+  ARRIVAL_ARRAY: State.coarse_f + State.fine_f at phase='arrival_f' tick=64 (after 32 advance_coarse_once; arrival_f = post-stream pre-collision)
+
+=== HARD CHECKS (unchanged v0.2 set) ===
+  finite[A_phi0.0000]=True cons=True mass_drift=5.969e-13 momx_drift=1.690e-13 momy_drift=2.753e-14 tol_abs=2.560e-10 init_rho_j_mismatch_vs_coarse_formula=1.110e-16
+  finite[B_phi0.0000]=True cons=True mass_drift=7.105e-13 momx_drift=2.970e-15 momy_drift=3.553e-15 tol_abs=2.560e-10 
+  finite[C_phi0.0000]=True cons=True mass_drift=4.547e-13 momx_drift=4.607e-15 momy_drift=6.495e-15 tol_abs=2.560e-10 
+  finite[A_phi1.5708]=True cons=True mass_drift=8.242e-13 momx_drift=1.033e-13 momy_drift=9.015e-14 tol_abs=2.560e-10 init_rho_j_mismatch_vs_coarse_formula=1.110e-16
+  finite[B_phi1.5708]=True cons=True mass_drift=6.821e-13 momx_drift=2.970e-15 momy_drift=3.553e-15 tol_abs=2.560e-10 
+  finite[C_phi1.5708]=True cons=True mass_drift=4.547e-13 momx_drift=4.607e-15 momy_drift=6.495e-15 tol_abs=2.560e-10 
+  finite[A_T_phi1.5708]=True cons=True mass_drift=7.105e-13 momx_drift=1.843e-14 momy_drift=6.062e-14 tol_abs=2.560e-10 init_rho_j_mismatch_vs_coarse_formula=1.110e-16
+  transpose_ok=True max_err=6.661e-16 (tol=1.000e-15)
+  t0 phi0.0000: AB_patch=1.084e-19 ok=True AC_out=2.168e-19 ok=True init_mm=1.110e-16 ok=True
+  t0 phi1.5708: AB_patch=1.084e-19 ok=True AC_out=2.168e-19 ok=True init_mm=1.110e-16 ok=True
+  init_mismatch[A_T]=1.110e-16 ok=True
+
+=== STRESS FINITE CHECKS (addition) ===
+  stress_finite[C_phi0.0000]=True R=1.00838364 a_u=5.991310e-04 P_sigma=2.372507e-05
+  stress_finite[B_phi0.0000]=True R=0.99855585 a_u=6.078606e-04 P_sigma=2.383616e-05
+  stress_finite[A_phi0.0000]=True R=1.01177462 a_u=5.949025e-04 P_sigma=2.363684e-05
+  stress_finite[C_phi1.5708]=True R=1.00838364 a_u=5.991310e-04 P_sigma=2.372507e-05
+  stress_finite[B_phi1.5708]=True R=0.99855585 a_u=6.078606e-04 P_sigma=2.383616e-05
+  stress_finite[A_phi1.5708]=True R=1.01185048 a_u=5.950623e-04 P_sigma=2.364496e-05
+  stress_finite[A_T_phi1.5708]=True R=1.01185048 a_u=5.950623e-04 P_sigma=2.364496e-05
+  N_BOOLEAN_HARD_CHECKS_V02=22: cons_A_T_phi1.5708,cons_A_phi0.0000,cons_A_phi1.5708,cons_B_phi0.0000,cons_B_phi1.5708,cons_C_phi0.0000,cons_C_phi1.5708,finite_A_T_phi1.5708,finite_A_phi0.0000,finite_A_phi1.5708,finite_B_phi0.0000,finite_B_phi1.5708,finite_C_phi0.0000,finite_C_phi1.5708,init_mismatch_ok_A_T_phi1.5708,init_mismatch_ok_phi0.0000,init_mismatch_ok_phi1.5708,t0_AB_patch_ok_phi0.0000,t0_AB_patch_ok_phi1.5708,t0_AC_out_ok_phi0.0000,t0_AC_out_ok_phi1.5708,transpose_ok
+  N_BOOLEAN_HARD_CHECKS_WITH_STRESS=29
+
+=== LOCAL STRESS OBSERVABLE at coarse step 32 ===
+FORMULA: R = P_sigma / (rho0 * nu * k * a_u); a_u from SAME run/tick/arrival
+WORDING: reported diagnostics only; phi probes phase structure only; no mechanism claim
+
+-- phi0.0000 --
+  R_A=1.0117746193  R_B=0.9985558540  R_C=1.0083836356
+  R_A/R_B=1.0132378827  R_A/R_C=1.0033627913
+  a_u A/B/C: 5.94902468e-04 6.07860566e-04 5.99130994e-04
+  P_sigma A/B/C: 2.36368412e-05 2.38361559e-05 2.37250678e-05
+  s_A(j): 9.915595e-01 8.382231e-01 5.539374e-01 1.826885e-01 -2.146875e-01 -5.725265e-01 -8.489390e-01 -9.987898e-01 -9.987898e-01 -8.489390e-01 -5.725265e-01 -2.146875e-01 1.826885e-01 5.539374e-01 8.382231e-01 9.915595e-01
+  s_B(j): 9.793689e-01 8.302688e-01 5.547679e-01 1.948086e-01 -1.948086e-01 -5.547679e-01 -8.302688e-01 -9.793689e-01 -9.793689e-01 -8.302688e-01 -5.547679e-01 -1.948086e-01 1.948086e-01 5.547679e-01 8.302688e-01 9.793689e-01
+  s_C(j): 9.890078e-01 8.384404e-01 5.602279e-01 1.967259e-01 -1.967259e-01 -5.602279e-01 -8.384404e-01 -9.890078e-01 -9.890078e-01 -8.384404e-01 -5.602279e-01 -1.967259e-01 1.967259e-01 5.602279e-01 8.384404e-01 9.890078e-01
+  s_A-s_B: 1.219061e-02 7.954261e-03 -8.305464e-04 -1.212007e-02 -1.987891e-02 -1.775863e-02 -1.867018e-02 -1.942089e-02 -1.942089e-02 -1.867018e-02 -1.775863e-02 -1.987891e-02 -1.212007e-02 -8.305464e-04 7.954261e-03 1.219061e-02
+  s_A-s_C: 2.551668e-03 -2.172403e-04 -6.290569e-03 -1.403738e-02 -1.796161e-02 -1.229861e-02 -1.049868e-02 -9.781945e-03 -9.781945e-03 -1.049868e-02 -1.229861e-02 -1.796161e-02 -1.403738e-02 -6.290569e-03 -2.172403e-04 2.551668e-03
+  FACE_ROWS j=3,4,11,12 flagged: j3:A=1.82689e-01,B=1.94809e-01,C=1.96726e-01,A-B=-1.21201e-02,A-C=-1.40374e-02 j4:A=-2.14687e-01,B=-1.94809e-01,C=-1.96726e-01,A-B=-1.98789e-02,A-C=-1.79616e-02 j11:A=-2.14687e-01,B=-1.94809e-01,C=-1.96726e-01,A-B=-1.98789e-02,A-C=-1.79616e-02 j12:A=1.82689e-01,B=1.94809e-01,C=1.96726e-01,A-B=-1.21201e-02,A-C=-1.40374e-02
+
+-- phi1.5708 --
+  R_A=1.0118504808  R_B=0.9985558540  R_C=1.0083836356
+  R_A/R_B=1.0133138539  R_A/R_C=1.0034380221
+  a_u A/B/C: 5.95062313e-04 6.07860566e-04 5.99130994e-04
+  P_sigma A/B/C: 2.36449649e-05 2.38361559e-05 2.37250678e-05
+  s_A(j): -1.994357e-01 -5.681758e-01 -8.528746e-01 -1.003712e+00 -9.868392e-01 -8.333476e-01 -5.581768e-01 -1.961536e-01 1.961536e-01 5.581768e-01 8.333476e-01 9.868392e-01 1.003712e+00 8.528746e-01 5.681758e-01 1.994357e-01
+  s_B(j): -1.948086e-01 -5.547679e-01 -8.302688e-01 -9.793689e-01 -9.793689e-01 -8.302688e-01 -5.547679e-01 -1.948086e-01 1.948086e-01 5.547679e-01 8.302688e-01 9.793689e-01 9.793689e-01 8.302688e-01 5.547679e-01 1.948086e-01
+  s_C(j): -1.967259e-01 -5.602279e-01 -8.384404e-01 -9.890078e-01 -9.890078e-01 -8.384404e-01 -5.602279e-01 -1.967259e-01 1.967259e-01 5.602279e-01 8.384404e-01 9.890078e-01 9.890078e-01 8.384404e-01 5.602279e-01 1.967259e-01
+  s_A-s_B: -4.627099e-03 -1.340791e-02 -2.260573e-02 -2.434262e-02 -7.470343e-03 -3.078759e-03 -3.408852e-03 -1.344997e-03 1.344997e-03 3.408852e-03 3.078759e-03 7.470343e-03 2.434262e-02 2.260573e-02 1.340791e-02 4.627099e-03
+  s_A-s_C: -2.709794e-03 -7.947886e-03 -1.443423e-02 -1.470367e-02 2.168600e-03 5.092742e-03 2.051171e-03 5.723084e-04 -5.723084e-04 -2.051171e-03 -5.092742e-03 -2.168600e-03 1.470367e-02 1.443423e-02 7.947886e-03 2.709794e-03
+  FACE_ROWS j=3,4,11,12 flagged: j3:A=-1.00371e+00,B=-9.79369e-01,C=-9.89008e-01,A-B=-2.43426e-02,A-C=-1.47037e-02 j4:A=-9.86839e-01,B=-9.79369e-01,C=-9.89008e-01,A-B=-7.47034e-03,A-C=2.16860e-03 j11:A=9.86839e-01,B=9.79369e-01,C=9.89008e-01,A-B=7.47034e-03,A-C=-2.16860e-03 j12:A=1.00371e+00,B=9.79369e-01,C=9.89008e-01,A-B=2.43426e-02,A-C=1.47037e-02
+
+-- A_T phi=1.5708 (R only, no profile) --
+  R_A_T=1.0118504808  a_u=5.95062313e-04  P_sigma=2.36449649e-05
+  profile=None (transpose)
+
+=== DECAY FITS (informational; same as v0.2) ===
+  analytic lambda = 0.01542126
+  A phi0.0000: lambda=0.01585222 stderr=8.572e-08 R2=1.000000 A0=1.000000e-03 A32=5.987423e-04
+  B phi0.0000: lambda=0.01539917 stderr=3.372e-15 R2=1.000000 A0=1.000000e-03 A32=6.117840e-04
+  C phi0.0000: lambda=0.01554973 stderr=1.906e-08 R2=1.000000 A0=1.000000e-03 A32=6.029981e-04
+  A phi1.5708: lambda=0.01584192 stderr=2.131e-07 R2=1.000000 A0=1.000000e-03 A32=5.989032e-04
+  B phi1.5708: lambda=0.01539917 stderr=3.372e-15 R2=1.000000 A0=1.000000e-03 A32=6.117840e-04
+  C phi1.5708: lambda=0.01554973 stderr=1.906e-08 R2=1.000000 A0=1.000000e-03 A32=6.029981e-04
+
+=== NUMERIC SUMMARY ===
+ALL_HARD_CHECKS_PASS_V02=True
+ALL_HARD_CHECKS_PASS_WITH_STRESS=True
+runtime_sec=0.77
+SUMMARY_LINES_BEGIN
+R phi0.0000 A=1.011774619306 B=0.998555854025 C=1.008383635570 A/B=1.013237882716 A/C=1.003362791319
+PROFILE_A phi0.0000 9.91559495e-01 8.38223110e-01 5.53937362e-01 1.82688509e-01 -2.14687493e-01 -5.72526539e-01 -8.48939033e-01 -9.98789772e-01 -9.98789772e-01 -8.48939033e-01 -5.72526539e-01 -2.14687493e-01 1.82688509e-01 5.53937362e-01 8.38223110e-01 9.91559495e-01
+PROFILE_B phi0.0000 9.79368883e-01 8.30268849e-01 5.54767909e-01 1.94808583e-01 -1.94808583e-01 -5.54767909e-01 -8.30268849e-01 -9.79368883e-01 -9.79368883e-01 -8.30268849e-01 -5.54767909e-01 -1.94808583e-01 1.94808583e-01 5.54767909e-01 8.30268849e-01 9.79368883e-01
+PROFILE_C phi0.0000 9.89007827e-01 8.38440351e-01 5.60227931e-01 1.96725888e-01 -1.96725888e-01 -5.60227931e-01 -8.38440351e-01 -9.89007827e-01 -9.89007827e-01 -8.38440351e-01 -5.60227931e-01 -1.96725888e-01 1.96725888e-01 5.60227931e-01 8.38440351e-01 9.89007827e-01
+PROFILE_A-B phi0.0000 1.21906117e-02 7.95426140e-03 -8.30546408e-04 -1.21200743e-02 -1.98789102e-02 -1.77586304e-02 -1.86701838e-02 -1.94208889e-02 -1.94208889e-02 -1.86701838e-02 -1.77586304e-02 -1.98789102e-02 -1.21200743e-02 -8.30546408e-04 7.95426140e-03 1.21906117e-02
+PROFILE_A-C phi0.0000 2.55166826e-03 -2.17240307e-04 -6.29056929e-03 -1.40373794e-02 -1.79616052e-02 -1.22986075e-02 -1.04986821e-02 -9.78194544e-03 -9.78194544e-03 -1.04986821e-02 -1.22986075e-02 -1.79616052e-02 -1.40373794e-02 -6.29056929e-03 -2.17240307e-04 2.55166826e-03
+R phi1.5708 A=1.011850480751 B=0.998555854025 C=1.008383635570 A/B=1.013313853874 A/C=1.003438022057
+PROFILE_A phi1.5708 -1.99435683e-01 -5.68175817e-01 -8.52874579e-01 -1.00371150e+00 -9.86839227e-01 -8.33347608e-01 -5.58176761e-01 -1.96153580e-01 1.96153580e-01 5.58176761e-01 8.33347608e-01 9.86839227e-01 1.00371150e+00 8.52874579e-01 5.68175817e-01 1.99435683e-01
+PROFILE_B phi1.5708 -1.94808583e-01 -5.54767909e-01 -8.30268849e-01 -9.79368883e-01 -9.79368883e-01 -8.30268849e-01 -5.54767909e-01 -1.94808583e-01 1.94808583e-01 5.54767909e-01 8.30268849e-01 9.79368883e-01 9.79368883e-01 8.30268849e-01 5.54767909e-01 1.94808583e-01
+PROFILE_C phi1.5708 -1.96725888e-01 -5.60227931e-01 -8.38440351e-01 -9.89007827e-01 -9.89007827e-01 -8.38440351e-01 -5.60227931e-01 -1.96725888e-01 1.96725888e-01 5.60227931e-01 8.38440351e-01 9.89007827e-01 9.89007827e-01 8.38440351e-01 5.60227931e-01 1.96725888e-01
+PROFILE_A-B phi1.5708 -4.62709942e-03 -1.34079086e-02 -2.26057300e-02 -2.43426175e-02 -7.47034346e-03 -3.07875936e-03 -3.40885205e-03 -1.34499672e-03 1.34499672e-03 3.40885205e-03 3.07875936e-03 7.47034346e-03 2.43426175e-02 2.26057300e-02 1.34079086e-02 4.62709942e-03
+PROFILE_A-C phi1.5708 -2.70979435e-03 -7.94788568e-03 -1.44342283e-02 -1.47036740e-02 2.16860001e-03 5.09274236e-03 2.05117083e-03 5.72308350e-04 -5.72308350e-04 -2.05117083e-03 -5.09274236e-03 -2.16860001e-03 1.47036740e-02 1.44342283e-02 7.94788568e-03 2.70979435e-03
+R A_T_phi1.5708 R=1.011850480751
+TRANSPOSE err=6.661338e-16 ok=True
+REF_SHA256=bba2a06a9f6517b32079ffff15e4060d8c3b7ed35f16ca134e1877226c9e4e1e
+SUMMARY_LINES_END
@@ -0,0 +1,115 @@
+Shear diagnostic v0.2 — Horsea review and single bounded run
+2026-10-13 (Asia/Shanghai); completed 13:02:45 local time.
+
+Result: exit 0; N_BOOLEAN_HARD_CHECKS=22; ALL_HARD_CHECKS_PASS=True.
+The delivered script ran exactly once: 7 runs, 32 coarse steps each. No extra
+cases, tests, retries, algorithm edits or tolerance changes were performed.
+The original script, Grok output, joint report and source manifest are retained
+byte-for-byte. The reference remains the pinned CPUREF-0.3 original.
+
+Review before execution
+Read the complete 790-line script, joint report, Grok output, input manifest
+and existing reference. Followed .github/skills/lbm-ref-architecture-guard/
+SKILL.md and its discovery/architecture checklists. No applicable AGENTS.md
+was found on the workspace/test-directory ancestor chain. No numerical issue
+blocks this fixed-scope rerun; this is Horsea's own review, not the Mac review.
+
+Reference findings (local files read only; no external package execution):
+1. ref/lbmpy/src/lbmpy/relaxationrates.py: lattice nu=(tau-1/2)/3.
+2. ref/OpenLB/src/core/unitConverter.h: physical nu=lattice nu*dx^2/dt.
+   With dx_f=dt_f=1/2, tau_c=.8 and tau_f=1.1 both give physical nu=.1;
+   the lattice velocity conversion is unchanged and B needs two fine steps.
+3. ref/lbmpy/tests/full_scenarios/shear_wave/scenario_shear_wave.py:
+   periodic modes decay as exp(-nu*|k|^2*t); log-amplitude fits estimate
+   decay. This supports the diagnostic, not an accuracy threshold here.
+4. ref/lbmpy/tests/test_shear_flow.py: the second moment needs the convective
+   contribution and relaxation correction considered before stress comparison.
+   The supplied global Pi_xy mean is not used as stress evidence.
+5. Existing cpu_reference.py: arrival_f input/output, tick advances by 2,
+   two fine hops, one coarse ghost explosion, closed-corner coalescence.
+   Reviewed full source and confirmed the unchanged hash before execution.
+
+Architecture/scope: script main -> run_uniform(B/C), run_composite(A/A_T) ->
+reference advance_coarse_once -> existing collision/hops/coalescence. Observation
+restricts rho and j to the same 16x16 coarse cells before dividing to obtain u.
+All observations are arrival_f. Exact cell-average sine velocity includes sinc
+and the patch coordinate offset; equilibrium of that velocity is not the exact
+cell average of nonlinear equilibrium populations. Fit 4..32 means coarse steps
+(reference ticks 8..64), despite the legacy PER-TICK table heading.
+Only the new script and this evidence directory are in scope. No src, existing
+test, strategy document, old evidence, reference or DynamisLab changes.
+
+Nonblocking limits: composite conservation uses the reference's _leaf_totals;
+this diagnostic is not a fresh independent conservation implementation. The
+uniform solver has an unused intermediate equilibrium calculation; it does not
+change its returned values. Retained both without cleanup to preserve delivery
+bytes. The explicit CPU_REFERENCE_PATH is required in this layout because the
+script's default filename is cpu_reference_v0.3.py.
+
+Execution evidence
+results_horsea.json records the exact complete parent/child argv, cwd, process
+environment, versions, timestamps, hard limits, exit code and measured memory.
+run_once.py is the stdlib-only recorder, not another numerical test. It refuses
+existing execution logs/results and checks the script/reference hashes and hard
+limits before launching. Both it and the child ran through existing prlimit:
+  address space 268435456 bytes (soft=hard)
+  file size 2097152 bytes (soft=hard), core 0
+OPENBLAS_NUM_THREADS=1, PYTHONDONTWRITEBYTECODE=1, PYTHONNOUSERSITE=1.
+PYTHONPATH is this exact multigrid directory; CPU_REFERENCE_PATH is its exact
+cpu_reference.py. PYTHONOPTIMIZE=0 keeps assertions enabled. No global changes.
+Existing Python 3.10.13 / NumPy 1.26.4; no dependency installation.
+Start/end UTC: 05:02:42.804589 / 05:02:45.056308 on 2026-10-13.
+Child wall time 2.237032 s; peak child RSS 37.69140625 MiB, parent 18.75 MiB.
+Combined stdout/stderr plus recorder metadata: 11421 bytes, below 2 MiB.
+No CelerisLab, Simulation or pycuda imports; no production/GPU/SSH/system work.
+
+Comparison with Grok
+HARD CHECKS and SUMMARY_LINES blocks match exactly at printed precision.
+All 22 individual Boolean values were parsed and matched, and checked against
+the printed list of 22 names. All 33 summary values match; all printed numeric
+differences in these two blocks are zero. See comparison.json for each value.
+This is not a claim of full-precision field or whole-stdout byte equality;
+reference path, runtime and recorder metadata are environment-specific.
+
+lambda per coarse step:
+  A phi0       0.0158522189
+  A phi(pi/2)  0.0158419175
+  B both       0.0153991657
+  C both       0.0155497331
+  analytic     0.0154212569
+Conservation mass drift <=8.242e-13, momentum drift <=1.690e-13, versus
+unchanged mass-scaled tolerance 2.560e-10. Transpose error 6.661338e-16
+passes 1e-15. Initial matches and all finite-state checks pass unchanged.
+
+Interpretation qualifications to the preserved joint report
+The ~2.94% / ~2.88% excess decay relative to B is a diagnostic observation
+over this fixed window, not a hard-threshold failure. A good exponential fit
+over steps 4..32 does not establish longer-time persistence or exclude all
+initialization effects. Symmetry cancels the global Pi mean; it is not stress
+transfer evidence. Time-held ghost supply and unscaled nonequilibrium copying
+are candidate explanations, not an exhaustive set or an identified mechanism.
+In particular, a negative time-interpolation result would not establish the
+other candidate by elimination. Original joint_report.md remains unchanged.
+
+Next minimal verification — specification only, not implemented or run
+First specify a phase- and unit-matched local shear observation on the same
+7-run/32-step setup: arrival_f Pi_xy^neq=sum(cx*cy*f)-rho*ux*uy, restricted
+with consistent volume weighting and the appropriate relaxation/unit conversion.
+Measure a cosine shear-mode projection and signed profiles on both sides of
+the patch faces, with B/C as controls; avoid cancellation by a domain mean.
+Keep all 22 checks, initialization and fit window fixed. Report differences
+without inventing a pass/fail stress threshold. This can test localization and
+phase structure, but does not alone prove causation.
+Before any later time-interpolated-ghost variant, jointly specify the available
+donor time levels, arrival_f/postcollision_g phase, interpolation order and flux
+accounting. Coarse g(t+1) is unavailable before the present fine hops; silently
+reordering the step or using unspecified future data would confound that test.
+No such variant, new observation code or reference continuation is part of this run.
+
+Audit
+baseline.json freezes HEAD, Git status and 281 existing file hashes before any
+input extraction. Its scope includes tracked/nonignored project files and the
+prior baseline's ignored records; excludes the read-only ref tree and bytecode.
+manifest.json records final old-file/input/reference verification and every new
+file's path, bytes and SHA256, except its own hash reported in the handoff.
+No commit or push. Stopped for joint acceptance.
@@ -0,0 +1,289 @@
+{
+  "created_utc": "2026-10-13T04:59:54.914211+00:00",
+  "head": "6e3756c587ec08ab6a55c4a1a5f4671822d3f0a0",
+  "git_status": " M pyproject.toml\n M setup.py\n M src/CelerisLab/__init__.py\n M src/CelerisLab/body/__init__.py\n M src/CelerisLab/body/ddf_patch.py\n M src/CelerisLab/body/manager.py\n M src/CelerisLab/body/preprocess/flag_overlay.py\n M src/CelerisLab/common/__init__.py\n M src/CelerisLab/common/checkpoint.py\n M src/CelerisLab/config.py\n M src/CelerisLab/configs/CONFIG.md\n M src/CelerisLab/cuda/__init__.py\n M src/CelerisLab/cuda/compiler_v2.py\n M src/CelerisLab/cuda/context.py\n M src/CelerisLab/lbm/__init__.py\n M src/CelerisLab/lbm/curved_links.py\n M src/CelerisLab/lbm/field.py\n M src/CelerisLab/lbm/initializers.py\n M src/CelerisLab/lbm/kernels/boundary/bounce_back.cuh\n M src/CelerisLab/lbm/kernels/boundary/curved_boundary.cuh\n M src/CelerisLab/lbm/kernels/boundary/inlet/common.cuh\n M src/CelerisLab/lbm/kernels/boundary/inlet/zou_he_local.cuh\n M src/CelerisLab/lbm/kernels/boundary/inlet_outlet.cuh\n M src/CelerisLab/lbm/kernels/config/config_grid.h\n M src/CelerisLab/lbm/kernels/config/config_method.h\n M src/CelerisLab/lbm/kernels/config/config_objects.h\n M src/CelerisLab/lbm/kernels/config/config_physics.h\n M src/CelerisLab/lbm/kernels/kernel_v2.cu\n M src/CelerisLab/lbm/kernels/operators/collision_mrt.cuh\n M src/CelerisLab/lbm/kernels/operators/collision_trt.cuh\n M src/CelerisLab/lbm/kernels/operators/forcing_guo.cuh\n M src/CelerisLab/lbm/kernels/step/aux_kernels.cu\n M src/CelerisLab/lbm/kernels/step/esopull_sync.cu\n M src/CelerisLab/lbm/kernels/step/init_flow.cu\n M src/CelerisLab/lbm/kernels/step/one_step_double.cu\n M src/CelerisLab/lbm/kernels/step/one_step_esopull.cu\n M src/CelerisLab/lbm/kernels/streaming/esopull_semantic_helpers.cuh\n M src/CelerisLab/lbm/stepper.py\n M src/CelerisLab/simulation.py\n M tests/integration/test_body_sync_e2e.py\n M tests/integration/test_ddf_patch.py\n M tests/integration/test_sync_bodies_skeleton.py\n M tests/integration/test_unified_obs.py\n M tests/postproc/experiment.ipynb\n M tests/validation/run_kan99b_rotating_cylinder.py\n M tests/validation/run_sah04_st_matrix.py\n M tests/validation/test_sensor_accuracy.py\n?? 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+    "tests/specs/kan99b.md": "b7e0669f0a6b677d902204f3427d1b3ac254bfe70c37d9cf995fb3e8f1fedfb1",
+    "tests/specs/sah04.md": "33dbe5e0fd63738abd055c4aa403c191b6de04e6efdbc568f1942c6d23c7459f",
+    "tests/specs/streakline_notes.md": "cd342d214c07eb608ac2e5b8697322c44c31dbf4d27dfdb5409de46ef474df4b",
+    "tests/unit/__init__.py": "17f57920d9c1ff46096ceb2af008eb38c4b98dc81ffa3c3d310e758e80ca1cd4",
+    "tests/unit/cpp/collision_regression.cpp": "f17acdff74ab82a62dc5402b42e3f6a149c262e89b140494164d6ebd630f5e14",
+    "tests/unit/cpp/planar_velocity.cpp": "8dea266984edc69d4e0e68007e038d7a587e99f84e33478d6656a66a56680933",
+    "tests/unit/cpp/reservoir.cpp": "c3eacaf0271400eb45ad559b571a8f7faa2a809d5f1857ffeb5592addce2cd0c",
+    "tests/unit/cpp/semantic_regression.cpp": "99dba074c0c0a32ea76026e7d54fc60af8e6d3dc5315c8900c470b4518878f39",
+    "tests/unit/cpp/slot_profile.cpp": "31ac58ccab175bf79fa59fc46d4c0842df18ab0a5e5916be84760d9da2b75788",
+    "tests/unit/test_body_flags.py": "ac6409157924e15a13a3d2cc2f1a09014b8b0198ba17c824f412ff20b19e2aac",
+    "tests/unit/test_build_contracts.py": "7bb237425e8bb481f312fa4841c484e280731e13c7cbb9a53dad3e7f98984ac3",
+    "tests/unit/test_context_ownership.py": "299fed30dd0f9bd4dadd8b27f50df2a6367bdb0ab2ca3f391f215fde7241f35a",
+    "tests/unit/test_equilibrium.py": "1ecbcc4547b1c846b75320463d828d6a36b6aae73208084fae476b1001c1bb50",
+    "tests/unit/test_initializers.py": "8b4e3358d925614984265ae73c142006b48fd1c3918cf84901f18afd9fe68c3a",
+    "tests/unit/test_numerical_operators.py": "6d1d560ef553a2af7adac7db3e325d96d7fe39073d5fe3e0e982439537385b27",
+    "tests/unit/test_pending_edits.py": "905a0dff23b123e8e38aaf364984c810fe51c39acd64aa271e343a4701d3d024",
+    "tests/unit/test_planar_velocity.py": "b656da0880b4234b1db805544edbe0d2473cbcc7c2c869c71d8251337f62a982",
+    "tests/unit/test_reservoir.py": "e718c78a53c3941aba7feb8ae4e8bb0b1726c1145de84febf91220c1917991c9",
+    "tests/unit/test_simulation_lifecycle.py": "77abdc33218c35e9c8b62dbd99ceddbaccd8417e7f0b539ea8859ea0175c663a",
+    "tests/unit/test_slot_velocity.py": "6a9494de9a32c350389ccbed58af48951f6b25a21a258537d2e8b73eb67cb11d",
+    "tests/unit/test_state_regressions.py": "0f69cfeb83428192f95688c76abcae7e5b9cf5f27c52bca4ac20c7f320044374",
+    "tests/unit/test_sync_plan.py": "983313ef783143231fa5a392f85f3bac011184773ccaf5d946504c206cabb721",
+    "tests/validation/analyze_j3_saved_frames.py": "438f67dac682b94c4950626f8de4fdcde48c3a4e9ecf8fdf1b0ada4b6e0e781a",
+    "tests/validation/diagnose_j3_lags.py": "286fcd65b3261667a847b9b26e213d0af92cf459faa6bbd774f78c8479ce31d7",
+    "tests/validation/multigrid/MULTIGRID_VERIFICATION_STRATEGY.md": "d4f3473da44abee6031a0e1bd4d0ca589077a18f15d2461836e4d2ebb98e458a",
+    "tests/validation/multigrid/cpu_reference.py": "bba2a06a9f6517b32079ffff15e4060d8c3b7ed35f16ca134e1877226c9e4e1e",
+    "tests/validation/multigrid/cpu_reference_v0.2.py": "b6adbad7da625ef6a6b97958ea9625030ed92676d0cada48e061c87bcf7ca8c9",
+    "tests/validation/multigrid/cpuref_0_3_evidence/README.txt": "1947ee0232b88b3cc2c506d0b0af5ba051ecc94aa8f7f09228ef3939cc95919b",
+    "tests/validation/multigrid/cpuref_0_3_evidence/README_grok.md": "065947e15b2242bce7d3eb05a3acdbb59939c621dcd5d31540ad4a1bd4416818",
+    "tests/validation/multigrid/cpuref_0_3_evidence/baseline.json": "0daaccee41cabeb17a00e2405e2c7fd0b80d36f2d01778eb39c9fd22b13d2d47",
+    "tests/validation/multigrid/cpuref_0_3_evidence/manifest.json": "2850ecaf2e19d010ba35eb54162371d82cc1a092831e08a03b6adf75a614988b",
+    "tests/validation/multigrid/cpuref_0_3_evidence/results_horsea.json": "914389afc39752bcd4132aa21fc8d5cbcf0ca75b1efd6a49becab15c2fa3361b",
+    "tests/validation/multigrid/cpuref_0_3_evidence/stdout_grok.txt": "73e4ef01138842981daaa534390f1463839e63833c11f4e8872f94f8eaadc717",
+    "tests/validation/multigrid/cpuref_0_3_evidence/stdout_horsea.txt": "457f1d2173496554c87ca6e61df518c0b8f1e0a28cdfd94b94ebbb61bc459d70",
+    "tests/validation/multigrid/test_cpu_reference.py": "ade5d4827f971aed7174b59d83769e7aa542338e625a9fc8db1e8b1805cb74ca",
+    "tests/validation/multigrid/test_open_corner_negative_control.py": "59a6f8ca80cdd63cb7827fbebf9b4b555c3793f19dd6bca801544ec10b5cbe1b",
+    "tests/validation/multigrid/test_tron_additions.py": "8e7a6a90b85e64c7326719e7b8bca2f6d34fb4c80690f0685f7e291ab93bd2a4",
+    "tests/validation/run_j1.py": "51b758a271ff358f931b3140a80082294a67e66c2fec0f8c19319e37f92aadc4",
+    "tests/validation/run_j2_slot.py": "b7d2d3aa06fcafc3ac62ed4a50892afbdb7f86e5720ce75a39ce317b6f571dad",
+    "tests/validation/run_j3_coverage.py": "329869519b7078e854d96241a7aad8ef93f35ac9be83f0be502c3a93523c3b13",
+    "tests/validation/run_j3_reservoir.py": "47535bc3569ce68c888d38978bc4f9077fd763a17829c20c081be52bb18a2903",
+    "tests/validation/run_kan99b_rotating_cylinder.py": "323186429a100f36b41ab9b81ade2da6a47e93be3ccb7034a3a6b97f4ee8eb00",
+    "tests/validation/run_perf_baseline.py": "93dde2eb1132f45ea69e1e285ff421dc97a83651a22c79571f299c1909650721",
+    "tests/validation/run_poiseuille.py": "e529288e2ffa8e00d281a9006723954d60a96ae4d025e8f28656c09287d4ff46",
+    "tests/validation/run_sah04_st_matrix.py": "9b9c0ce063e07a316846635ee769b837ed26be6bf039f78f4219c10b516f8006",
+    "tests/validation/test_sensor_accuracy.py": "c6038a9e7a597a1738814bd15e6ecf357cfd271cdc2a132d47943c5280ac0ef9"
+  }
+}
@@ -0,0 +1,296 @@
+{
+  "comparison_precision": "Printed output precision only; no claim of bitwise full-precision field equivalence. No new tolerance or diagnostic pass/fail threshold introduced.",
+  "all_22_boolean_checks_match_and_pass": true,
+  "boolean_checks": {
+    "finite_A_phi0.0000": true,
+    "cons_A_phi0.0000": true,
+    "finite_B_phi0.0000": true,
+    "cons_B_phi0.0000": true,
+    "finite_C_phi0.0000": true,
+    "cons_C_phi0.0000": true,
+    "finite_A_phi1.5708": true,
+    "cons_A_phi1.5708": true,
+    "finite_B_phi1.5708": true,
+    "cons_B_phi1.5708": true,
+    "finite_C_phi1.5708": true,
+    "cons_C_phi1.5708": true,
+    "finite_A_T_phi1.5708": true,
+    "cons_A_T_phi1.5708": true,
+    "transpose_ok": true,
+    "t0_AB_patch_ok_phi0.0000": true,
+    "t0_AC_out_ok_phi0.0000": true,
+    "init_mismatch_ok_phi0.0000": true,
+    "t0_AB_patch_ok_phi1.5708": true,
+    "t0_AC_out_ok_phi1.5708": true,
+    "init_mismatch_ok_phi1.5708": true,
+    "init_mismatch_ok_A_T_phi1.5708": true
+  },
+  "summary_metrics": [
+    {
+      "row": "FIT A phi0.0000",
+      "metric": "lambda",
+      "grok": "0.0158522189",
+      "horsea": "0.0158522189",
+      "identical_printed": true,
+      "horsea_minus_grok": "0E-10"
+    },
+    {
+      "row": "FIT A phi0.0000",
+      "metric": "stderr",
+      "grok": "8.571672e-08",
+      "horsea": "8.571672e-08",
+      "identical_printed": true,
+      "horsea_minus_grok": "0E-14"
+    },
+    {
+      "row": "FIT A phi0.0000",
+      "metric": "R2",
+      "grok": "1.00000000",
+      "horsea": "1.00000000",
+      "identical_printed": true,
+      "horsea_minus_grok": "0E-8"
+    },
+    {
+      "row": "FIT A phi0.0000",
+      "metric": "A0",
+      "grok": "1.0000000000e-03",
+      "horsea": "1.0000000000e-03",
+      "identical_printed": true,
+      "horsea_minus_grok": "0E-13"
+    },
+    {
+      "row": "FIT A phi0.0000",
+      "metric": "A32",
+      "grok": "5.9874229183e-04",
+      "horsea": "5.9874229183e-04",
+      "identical_printed": true,
+      "horsea_minus_grok": "0E-14"
+    },
+    {
+      "row": "FIT B phi0.0000",
+      "metric": "lambda",
+      "grok": "0.0153991657",
+      "horsea": "0.0153991657",
+      "identical_printed": true,
+      "horsea_minus_grok": "0E-10"
+    },
+    {
+      "row": "FIT B phi0.0000",
+      "metric": "stderr",
+      "grok": "3.372428e-15",
+      "horsea": "3.372428e-15",
+      "identical_printed": true,
+      "horsea_minus_grok": "0E-21"
+    },
+    {
+      "row": "FIT B phi0.0000",
+      "metric": "R2",
+      "grok": "1.00000000",
+      "horsea": "1.00000000",
+      "identical_printed": true,
+      "horsea_minus_grok": "0E-8"
+    },
+    {
+      "row": "FIT B phi0.0000",
+      "metric": "A0",
+      "grok": "1.0000000000e-03",
+      "horsea": "1.0000000000e-03",
+      "identical_printed": true,
+      "horsea_minus_grok": "0E-13"
+    },
+    {
+      "row": "FIT B phi0.0000",
+      "metric": "A32",
+      "grok": "6.1178402808e-04",
+      "horsea": "6.1178402808e-04",
+      "identical_printed": true,
+      "horsea_minus_grok": "0E-14"
+    },
+    {
+      "row": "FIT C phi0.0000",
+      "metric": "lambda",
+      "grok": "0.0155497331",
+      "horsea": "0.0155497331",
+      "identical_printed": true,
+      "horsea_minus_grok": "0E-10"
+    },
+    {
+      "row": "FIT C phi0.0000",
+      "metric": "stderr",
+      "grok": "1.906424e-08",
+      "horsea": "1.906424e-08",
+      "identical_printed": true,
+      "horsea_minus_grok": "0E-14"
+    },
+    {
+      "row": "FIT C phi0.0000",
+      "metric": "R2",
+      "grok": "1.00000000",
+      "horsea": "1.00000000",
+      "identical_printed": true,
+      "horsea_minus_grok": "0E-8"
+    },
+    {
+      "row": "FIT C phi0.0000",
+      "metric": "A0",
+      "grok": "1.0000000000e-03",
+      "horsea": "1.0000000000e-03",
+      "identical_printed": true,
+      "horsea_minus_grok": "0E-13"
+    },
+    {
+      "row": "FIT C phi0.0000",
+      "metric": "A32",
+      "grok": "6.0299811110e-04",
+      "horsea": "6.0299811110e-04",
+      "identical_printed": true,
+      "horsea_minus_grok": "0E-14"
+    },
+    {
+      "row": "FIT A phi1.5708",
+      "metric": "lambda",
+      "grok": "0.0158419175",
+      "horsea": "0.0158419175",
+      "identical_printed": true,
+      "horsea_minus_grok": "0E-10"
+    },
+    {
+      "row": "FIT A phi1.5708",
+      "metric": "stderr",
+      "grok": "2.130663e-07",
+      "horsea": "2.130663e-07",
+      "identical_printed": true,
+      "horsea_minus_grok": "0E-13"
+    },
+    {
+      "row": "FIT A phi1.5708",
+      "metric": "R2",
+      "grok": "1.00000000",
+      "horsea": "1.00000000",
+      "identical_printed": true,
+      "horsea_minus_grok": "0E-8"
+    },
+    {
+      "row": "FIT A phi1.5708",
+      "metric": "A0",
+      "grok": "1.0000000000e-03",
+      "horsea": "1.0000000000e-03",
+      "identical_printed": true,
+      "horsea_minus_grok": "0E-13"
+    },
+    {
+      "row": "FIT A phi1.5708",
+      "metric": "A32",
+      "grok": "5.9890316832e-04",
+      "horsea": "5.9890316832e-04",
+      "identical_printed": true,
+      "horsea_minus_grok": "0E-14"
+    },
+    {
+      "row": "FIT B phi1.5708",
+      "metric": "lambda",
+      "grok": "0.0153991657",
+      "horsea": "0.0153991657",
+      "identical_printed": true,
+      "horsea_minus_grok": "0E-10"
+    },
+    {
+      "row": "FIT B phi1.5708",
+      "metric": "stderr",
+      "grok": "3.372390e-15",
+      "horsea": "3.372390e-15",
+      "identical_printed": true,
+      "horsea_minus_grok": "0E-21"
+    },
+    {
+      "row": "FIT B phi1.5708",
+      "metric": "R2",
+      "grok": "1.00000000",
+      "horsea": "1.00000000",
+      "identical_printed": true,
+      "horsea_minus_grok": "0E-8"
+    },
+    {
+      "row": "FIT B phi1.5708",
+      "metric": "A0",
+      "grok": "1.0000000000e-03",
+      "horsea": "1.0000000000e-03",
+      "identical_printed": true,
+      "horsea_minus_grok": "0E-13"
+    },
+    {
+      "row": "FIT B phi1.5708",
+      "metric": "A32",
+      "grok": "6.1178402808e-04",
+      "horsea": "6.1178402808e-04",
+      "identical_printed": true,
+      "horsea_minus_grok": "0E-14"
+    },
+    {
+      "row": "FIT C phi1.5708",
+      "metric": "lambda",
+      "grok": "0.0155497331",
+      "horsea": "0.0155497331",
+      "identical_printed": true,
+      "horsea_minus_grok": "0E-10"
+    },
+    {
+      "row": "FIT C phi1.5708",
+      "metric": "stderr",
+      "grok": "1.906424e-08",
+      "horsea": "1.906424e-08",
+      "identical_printed": true,
+      "horsea_minus_grok": "0E-14"
+    },
+    {
+      "row": "FIT C phi1.5708",
+      "metric": "R2",
+      "grok": "1.00000000",
+      "horsea": "1.00000000",
+      "identical_printed": true,
+      "horsea_minus_grok": "0E-8"
+    },
+    {
+      "row": "FIT C phi1.5708",
+      "metric": "A0",
+      "grok": "1.0000000000e-03",
+      "horsea": "1.0000000000e-03",
+      "identical_printed": true,
+      "horsea_minus_grok": "0E-13"
+    },
+    {
+      "row": "FIT C phi1.5708",
+      "metric": "A32",
+      "grok": "6.0299811110e-04",
+      "horsea": "6.0299811110e-04",
+      "identical_printed": true,
+      "horsea_minus_grok": "0E-14"
+    },
+    {
+      "row": "TRANSPOSE",
+      "metric": "err",
+      "grok": "6.661338e-16",
+      "horsea": "6.661338e-16",
+      "identical_printed": true,
+      "horsea_minus_grok": "0E-22"
+    },
+    {
+      "row": "TRANSPOSE",
+      "metric": "ok",
+      "grok": "True",
+      "horsea": "True",
+      "identical_printed": true
+    },
+    {
+      "row": "ANALYTIC",
+      "metric": "lambda",
+      "grok": "0.0154212569",
+      "horsea": "0.0154212569",
+      "identical_printed": true,
+      "horsea_minus_grok": "0E-10"
+    }
+  ],
+  "hard_check_numeric_differences": [],
+  "hard_block_identical": true,
+  "summary_block_identical": true
+}
@@ -0,0 +1,96 @@
+# Shear interface diagnostic v0: merged FINAL report v2 (ClaudeWorker + Grok, 2026-10-13)
+
+Supersedes 17_shear_diagnostic_v0_merged_report.md (14BeLNaB7M3ALgrDubBeDu3LO7DeR_JYZ), which was
+written before the final pinning. All numbers below were re-checked against the pinned v0.2 stdout.
+Status: diagnostic finding only. Not a solver-failure gate. No stress-transfer mechanism has been identified.
+
+## 0. Pinned artifacts (Drive folder 1v-ptYZ3JyU8mVmiyBizcIuA440FYlMSz)
+- Reference: unchanged CPUREF-0.3, SHA256 bba2a06a9f6517b32079ffff15e4060d8c3b7ed35f16ca134e1877226c9e4e1e
+- Script: shear_diagnostic_v0_2.py (1_IFVwcgAekq1geeam5jkoUyjXBVXJWRA),
+  SHA256 a8b1cf2f7abd00efc4d068bbd27bb2317144a6ca4c545d9b2e0dcf421eadebc6
+- Stdout (Grok sandbox): stdout_shear_diagnostic_v0_2.txt (10TxZvxweLZXCv_WMzuk6jKzLwlRwOdmg),
+  SHA256 28ddd1267ca91a772f5a6bfc65d949c9a4ea7dac5c9ba3a0bdb168492810b670
+- Horsea confirmation:
+  - Command: CPU_REFERENCE_PATH=<path>/cpu_reference_v0.3.py python3 shear_diagnostic_v0_2.py
+  - Expected: exit 0.
+  - Compare the HARD CHECKS and SUMMARY_LINES blocks, not the whole-file hash: REF_PATH and runtime differ
+    between machines.
+- History:
+  - v0 (1Kf3_99u210n_FyLKRGEMoB40zHzQgHHM) and v0.1 (1pH9q39daAXie4B0IFEicSLYOQOIMz9tW) differ from v0.2
+    only in the checker and reporting code.
+  - The lambda values are bit-identical across v0, v0.1 and v0.2.
+  - Reviews: 16_CLAUDE review (1hhuCAXAURP2qVyptM4pgIlDT_qqaicY9); root's static review via TRON.
+
+## 1. Frozen setup
+- Geometry: 16^2 periodic coarse grid, static 2:1 patch [4,12)^2, D2Q9 SRT, tau_c = 0.8, tau_f = 1.1
+  (nu = 0.1 coarse units). CPU only; runtime 0.55 s.
+- Mode: u_x = U0 sin(2*pi*y/16 + phi), U0 = 1e-3, phi in {0, pi/2}.
+- 7 runs: A composite, B uniform-fine 32^2, C uniform-coarse 16^2 for each phi; plus A transposed at phi = pi/2.
+- Duration: 32 coarse steps. Startup = steps 0-3 (reported). Fit = steps 4-32 (= CPUREF ticks 8..64).
+- Initialisation: equilibrium of the exact cell-average velocity (sinc factor); fine centres include the patch
+  offset. This is not the exact cell average of the nonlinear f_eq.
+- Observation: all grids at arrival_f (post-stream, pre-collision). Restrict rho and j by 2x2 averaging,
+  then u = j/rho. One common 16^2 modal projection.
+
+## 2. Hard checks: 22 Booleans, all True (ALL_HARD_CHECKS_PASS = True)
+- Cross-review corrections:
+  - A_T is now included (Claude B1).
+  - The t0 and init conventions are now Boolean assertions, not just printed values (root).
+- Finite active states: all 7 runs.
+- Conservation drift: mass <= 8.2e-13, momentum <= 1.7e-13 (tolerance 1e-12 x mass ~ 2.56e-10).
+- Transpose: error 6.7e-16 (tolerance 1e-15).
+- t0 restricted u:
+  - A vs B on the patch: 1.1e-19.
+  - A vs C outside the patch: 2.2e-19.
+  - Tolerance: T0_TOL = 1e-15.
+- Init rho/j mismatch: 1.1e-16 for A (both phi) and for A_T (tolerance INIT_TOL = 1e-12).
+
+## 3. Reported numbers (no thresholds)
+Decay rate lambda per coarse step. The analytic value nu*k^2 is 0.0154213.
+
+| run | phi=0 | phi=pi/2 | stderr |
+|---|---|---|---|
+| A composite | 0.0158522 | 0.0158419 | <= 2.1e-7 |
+| B uniform-fine | 0.0153992 | 0.0153992 | ~3e-15 |
+| C uniform-coarse | 0.0155497 | 0.0155497 | 1.9e-8 |
+
+- The composite decays ~2.9% faster than uniform-fine and also faster than uniform-coarse.
+  The fit is exponential, so this is a persistent rate excess, not a startup transient.
+  s = (A-B)/(C-B) = 3.01 / 2.94, with denominator 1.5e-4, well above fit noise.
+- e_IF/e_CB at step 32 = 1.50 / 1.57 (unnormalised L2 over 256 cells).
+- Per-cell RMS of (u_A - u_B) at step 32 (patch = 64 cells, outside = 192):
+  - phi=0: patch 9.92e-6, outside 9.04e-6 (ratio 1.10). The patch holds 28.6% of the error energy on 25% of
+    the area.
+  - phi=pi/2: patch 1.15e-5, outside 9.01e-6 (ratio 1.28). The patch holds 35.2% of the error energy on 25%
+    of the area.
+  - Reference: C-B per-cell RMS is 6.2e-6.
+  Reading: the error is spread over the whole domain, with mild concentration on the patch at phi = pi/2.
+- Profile of the x-averaged (u_A - u_B)(y):
+  - phi=0: mostly modal, with a larger deficit inside the patch.
+  - phi=pi/2: a non-modal kink at y ~ 3.5-4.5, where the horizontal interface sits at maximum shear.
+    The non-modal residual is 5.5e-2 vs 2.2e-2 at phi=0 (L2/U0).
+- Acoustic sensors at step 32: max|u_y|/U0 = 3.7e-3 / 5.0e-3, max|rho-1| ~ 4e-6.
+- Pi_xy: the domain mean cancels by symmetry. It is not a stress-transfer sensor, is still printed in stdout,
+  and is excluded from the conclusions.
+
+## 4. Limitations
+- One resolution, wavenumber, tau pair, patch and duration. No convergence order can be inferred.
+- Approximate equilibrium-only initialisation. The startup transient is excluded from the fit, not modelled.
+- B and C use the script's own uniform SRT. Its formulas were checked against the reference, but it is a
+  separate implementation.
+- Sandbox run only. Bounded Horsea confirmation is pending.
+- Attribution is open. The data are consistent with an interface stress-transfer error but do not show one.
+  The candidates are two stated CPUREF simplifications, neither claimed wrong:
+  (i) post-collision coarse packets are copied into the fine ghosts without rescaling;
+  (ii) the ghosts hold g_c(t) for both fine hops.
+
+## 5. One next discriminating test (not run; write a spec first)
+Same 7-run freeze, changing exactly one simplification: time-interpolated ghosts between the two fine hops,
+with the unrescaled copy kept.
+- If lambda_A - lambda_B shrinks, the ghost hold is implicated.
+- If it does not, the unrescaled copy becomes the remaining suspect, by elimination only.
+- Spec caveat: in the current step order, coarse g_c(t+1) does not exist before the fine hops. The
+  interpolation source (extrapolation or a reordered coarse step) has to be specified first, and the change
+  reviewed as a reference-algorithm change.
+- Static prior (ClaudeWorker, an estimate, not evidence): the ghost-hold lag is about lambda*dt/2 ~ 1% of the
+  local velocity, while the non-equilibrium copy mismatch scales with k*U0. So the result may well be negative.
@@ -0,0 +1,97 @@
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+  "old_git_status_entries_removed": [],
+  "only_authorized_new_git_paths": true,
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+  "reference_sha256": "bba2a06a9f6517b32079ffff15e4060d8c3b7ed35f16ca134e1877226c9e4e1e",
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+  "delivered_byte_deviations": [],
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+      "path": "tests/validation/multigrid/shear_v0_2_evidence/run_once.py",
+      "bytes": 3245,
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+}
@@ -0,0 +1,65 @@
+{
+  "started_utc": "2026-10-13T05:02:42.804589+00:00",
+  "cwd": "/home/frank14f/CelerisLab/tests/validation/multigrid",
+  "parent_command": [
+    "env",
+    "OPENBLAS_NUM_THREADS=1",
+    "PYTHONDONTWRITEBYTECODE=1",
+    "PYTHONNOUSERSITE=1",
+    "PYTHONOPTIMIZE=0",
+    "PYTHONPATH=/home/frank14f/CelerisLab/tests/validation/multigrid",
+    "CPU_REFERENCE_PATH=/home/frank14f/CelerisLab/tests/validation/multigrid/cpu_reference.py",
+    "/usr/bin/prlimit",
+    "--as=268435456",
+    "--fsize=2097152",
+    "--core=0",
+    "--",
+    "/home/frank14f/anaconda3/envs/pycuda_3_10/bin/python",
+    "-B",
+    "/home/frank14f/CelerisLab/tests/validation/multigrid/shear_v0_2_evidence/run_once.py"
+  ],
+  "script_command": [
+    "/usr/bin/prlimit",
+    "--as=268435456",
+    "--fsize=2097152",
+    "--core=0",
+    "--",
+    "/home/frank14f/anaconda3/envs/pycuda_3_10/bin/python",
+    "-B",
+    "/home/frank14f/CelerisLab/tests/validation/multigrid/shear_diagnostic_v0_2.py"
+  ],
+  "environment": {
+    "OPENBLAS_NUM_THREADS": "1",
+    "PYTHONDONTWRITEBYTECODE": "1",
+    "PYTHONNOUSERSITE": "1",
+    "PYTHONOPTIMIZE": "0",
+    "PYTHONPATH": "/home/frank14f/CelerisLab/tests/validation/multigrid",
+    "CPU_REFERENCE_PATH": "/home/frank14f/CelerisLab/tests/validation/multigrid/cpu_reference.py"
+  },
+  "python_version": "3.10.13 (main, Sep 11 2023, 13:44:35) [GCC 11.2.0]",
+  "numpy_version_from_installed_metadata": "1.26.4",
+  "platform": "Linux-6.8.0-138-generic-x86_64-with-glibc2.35",
+  "hard_limits": {
+    "address_space_bytes": [
+      268435456,
+      268435456
+    ],
+    "output_file_bytes": [
+      2097152,
+      2097152
+    ],
+    "core_bytes": [
+      0,
+      0
+    ]
+  },
+  "planned_runs": 7,
+  "coarse_steps_per_run": 32,
+  "attempt": 1,
+  "returncode": 0,
+  "elapsed_seconds": 2.2370318549801596,
+  "child_peak_rss_MiB": 37.69140625,
+  "parent_peak_rss_MiB": 18.75,
+  "completed_utc": "2026-10-13T05:02:45.056308+00:00",
+  "stdout_bytes": 11421
+}
@@ -0,0 +1,74 @@
+"""Bounded execution recorder; refuses to overwrite evidence or repeat a run."""
+import datetime
+import hashlib
+import importlib.metadata
+import json
+import os
+from pathlib import Path
+import platform
+import resource
+import shlex
+import subprocess
+import sys
+import time
+
+evidence = Path(__file__).resolve().parent
+base = evidence.parent
+script = base / "shear_diagnostic_v0_2.py"
+reference = base / "cpu_reference.py"
+expected_env = {
+    "OPENBLAS_NUM_THREADS": "1",
+    "PYTHONDONTWRITEBYTECODE": "1",
+    "PYTHONNOUSERSITE": "1",
+    "PYTHONOPTIMIZE": "0",
+    "PYTHONPATH": str(base),
+    "CPU_REFERENCE_PATH": str(reference),
+}
+limits = {
+    "address_space_bytes": (resource.RLIMIT_AS, 268435456),
+    "output_file_bytes": (resource.RLIMIT_FSIZE, 2097152),
+    "core_bytes": (resource.RLIMIT_CORE, 0),
+}
+assert all(os.environ.get(k) == v for k, v in expected_env.items())
+assert all(resource.getrlimit(key) == (value, value) for key, value in limits.values())
+assert sys.executable == "/home/frank14f/anaconda3/envs/pycuda_3_10/bin/python"
+assert hashlib.sha256(script.read_bytes()).hexdigest() == "a8b1cf2f7abd00efc4d068bbd27bb2317144a6ca4c545d9b2e0dcf421eadebc6"
+assert hashlib.sha256(reference.read_bytes()).hexdigest() == "bba2a06a9f6517b32079ffff15e4060d8c3b7ed35f16ca134e1877226c9e4e1e"
+log_path = evidence / "stdout_horsea.txt"
+result_path = evidence / "results_horsea.json"
+assert not log_path.exists() and not result_path.exists(), "Existing execution evidence; do not rerun"
+prefix = ["/usr/bin/prlimit", "--as=268435456", "--fsize=2097152", "--core=0", "--", sys.executable, "-B"]
+command = prefix + [str(script)]
+report = {
+    "started_utc": datetime.datetime.now(datetime.timezone.utc).isoformat(),
+    "cwd": str(base),
+    "parent_command": ["env"] + [f"{k}={v}" for k, v in expected_env.items()] + prefix + [str(Path(__file__).resolve())],
+    "script_command": command,
+    "environment": expected_env,
+    "python_version": sys.version,
+    "numpy_version_from_installed_metadata": importlib.metadata.version("numpy"),
+    "platform": platform.platform(),
+    "hard_limits": {name: resource.getrlimit(key) for name, (key, _) in limits.items()},
+    "planned_runs": 7,
+    "coarse_steps_per_run": 32,
+    "attempt": 1,
+}
+with log_path.open("xb", buffering=0) as log:
+    log.write(("RECORDER " + json.dumps(report) + "\nCOMMAND " + shlex.join(command) + "\n").encode())
+    start = time.monotonic()
+    child = subprocess.run(command, cwd=base, stdout=log, stderr=subprocess.STDOUT, check=False)
+    report.update(
+        returncode=child.returncode,
+        elapsed_seconds=time.monotonic() - start,
+        child_peak_rss_MiB=resource.getrusage(resource.RUSAGE_CHILDREN).ru_maxrss / 1024,
+        parent_peak_rss_MiB=resource.getrusage(resource.RUSAGE_SELF).ru_maxrss / 1024,
+        completed_utc=datetime.datetime.now(datetime.timezone.utc).isoformat(),
+    )
+    log.write(("\nRUN_RESULT " + json.dumps(report) + "\n").encode())
+report["stdout_bytes"] = log_path.stat().st_size
+with result_path.open("x") as result:
+    json.dump(report, result, indent=2)
+    result.write("\n")
+print(json.dumps(report, indent=2))
+assert report["stdout_bytes"] < 2097152
+sys.exit(child.returncode if child.returncode >= 0 else 1)
@@ -0,0 +1,20 @@
+[
+  {
+    "id": "1_IFVwcgAekq1geeam5jkoUyjXBVXJWRA",
+    "name": "shear_diagnostic_v0_2.py",
+    "bytes": 30308,
+    "sha256": "a8b1cf2f7abd00efc4d068bbd27bb2317144a6ca4c545d9b2e0dcf421eadebc6"
+  },
+  {
+    "id": "10TxZvxweLZXCv_WMzuk6jKzLwlRwOdmg",
+    "name": "stdout_grok.txt",
+    "bytes": 7950,
+    "sha256": "28ddd1267ca91a772f5a6bfc65d949c9a4ea7dac5c9ba3a0bdb168492810b670"
+  },
+  {
+    "id": "1u21zTKWxnfjAnBwhlk_XhWJjdQTC_ytb",
+    "name": "joint_report.md",
+    "bytes": 6110,
+    "sha256": "1860b8082108c8b8a87998af90cd0b81dce1c04e9f6c67b41e0912f9fef6cc9c"
+  }
+]
@@ -0,0 +1,89 @@
+=== shear_diagnostic_v0.2 against CPUREF-0.3 ===
+REF_PATH=/workspace/shear_diag/cpu_reference_v0.3.py
+REF_SHA256=bba2a06a9f6517b32079ffff15e4060d8c3b7ed35f16ca134e1877226c9e4e1e
+API_VERSION=CPUREF-0.3
+U0=0.001 tau_c=0.8 tau_f=1.1 steps=32 nu=0.1 k=0.39269908169872414
+nu*k^2=0.01542126  (analytic decay rate)
+INIT: equilibrium of averaged velocity (NOT exact cell-avg of nonlinear feq)
+UNITS: fit/report 'steps' are coarse steps; CPUREF tick = fine step count
+  fit window coarse steps 4..32 = CPUREF ticks 8..64
+  startup coarse steps 0..3 = CPUREF ticks 0..6
+  nonmodal/e_IF/e_CB are unnormalised L2 sums over 256 coarse cells
+  (per-cell RMS = value/16); nonmodal is already /U0
+CONS_TOL=1e-12 relative to mass (~256) => abs ~2.560e-10
+
+-- running C (uniform-coarse) phi0.0000
+-- running B (uniform-fine) phi0.0000
+-- running A (composite CPUREF) phi0.0000
+-- running C (uniform-coarse) phi1.5708
+-- running B (uniform-fine) phi1.5708
+-- running A (composite CPUREF) phi1.5708
+-- running A transpose phi=1.5707963267948966
+
+=== HARD CHECKS ===
+  finite[A_phi0.0000]=True cons=True mass_drift=5.969e-13 momx_drift=1.690e-13 momy_drift=2.753e-14 tol_abs=2.560e-10 (CONS_TOL*mass=1e-12*|256|) init_rho_j_mismatch_vs_coarse_formula=1.110e-16
+  finite[B_phi0.0000]=True cons=True mass_drift=7.105e-13 momx_drift=2.970e-15 momy_drift=3.553e-15 tol_abs=2.560e-10 (CONS_TOL*mass=1e-12*|256|) 
+  finite[C_phi0.0000]=True cons=True mass_drift=4.547e-13 momx_drift=4.607e-15 momy_drift=6.495e-15 tol_abs=2.560e-10 (CONS_TOL*mass=1e-12*|256|) 
+  finite[A_phi1.5708]=True cons=True mass_drift=8.242e-13 momx_drift=1.033e-13 momy_drift=9.015e-14 tol_abs=2.560e-10 (CONS_TOL*mass=1e-12*|256|) init_rho_j_mismatch_vs_coarse_formula=1.110e-16
+  finite[B_phi1.5708]=True cons=True mass_drift=6.821e-13 momx_drift=2.970e-15 momy_drift=3.553e-15 tol_abs=2.560e-10 (CONS_TOL*mass=1e-12*|256|) 
+  finite[C_phi1.5708]=True cons=True mass_drift=4.547e-13 momx_drift=4.607e-15 momy_drift=6.495e-15 tol_abs=2.560e-10 (CONS_TOL*mass=1e-12*|256|) 
+  finite[A_T_phi1.5708]=True cons=True mass_drift=7.105e-13 momx_drift=1.843e-14 momy_drift=6.062e-14 tol_abs=2.560e-10 (CONS_TOL*mass=1e-12*|256|) init_rho_j_mismatch_vs_coarse_formula=1.110e-16
+  transpose_ok=True max_err=6.661e-16 (tol=1.000e-15)
+  t0 amp A/B/C phi0.0000: 1.00000000e-03 1.00000000e-03 1.00000000e-03
+  t0 max|ux A-B| patch=1.084e-19  |A-C| outside=2.168e-19  |B-C| all=6.245e-17
+  t0_AB_patch_ok=True t0_AC_out_ok=True (T0_TOL=1.0e-15)  init_mismatch=1.110e-16 ok=True (INIT_TOL=1.0e-12)
+  t0 amp A/B/C phi1.5708: 1.00000000e-03 1.00000000e-03 1.00000000e-03
+  t0 max|ux A-B| patch=1.084e-19  |A-C| outside=2.168e-19  |B-C| all=6.245e-17
+  t0_AB_patch_ok=True t0_AC_out_ok=True (T0_TOL=1.0e-15)  init_mismatch=1.110e-16 ok=True (INIT_TOL=1.0e-12)
+  init_mismatch[A_T]=1.110e-16 ok=True (INIT_TOL=1.0e-12)
+  N_BOOLEAN_HARD_CHECKS=22: cons_A_T_phi1.5708,cons_A_phi0.0000,cons_A_phi1.5708,cons_B_phi0.0000,cons_B_phi1.5708,cons_C_phi0.0000,cons_C_phi1.5708,finite_A_T_phi1.5708,finite_A_phi0.0000,finite_A_phi1.5708,finite_B_phi0.0000,finite_B_phi1.5708,finite_C_phi0.0000,finite_C_phi1.5708,init_mismatch_ok_A_T_phi1.5708,init_mismatch_ok_phi0.0000,init_mismatch_ok_phi1.5708,t0_AB_patch_ok_phi0.0000,t0_AB_patch_ok_phi1.5708,t0_AC_out_ok_phi0.0000,t0_AC_out_ok_phi1.5708,transpose_ok
+
+=== DECAY FITS (coarse steps 4..32 = CPUREF ticks 8..64) ===
+  analytic lambda = nu*k^2 = 0.01542126
+  A phi0.0000: lambda=0.01585222 stderr=8.572e-08 R2=1.000000 A0=1.000000e-03 A32=5.987423e-04
+  B phi0.0000: lambda=0.01539917 stderr=3.372e-15 R2=1.000000 A0=1.000000e-03 A32=6.117840e-04
+  C phi0.0000: lambda=0.01554973 stderr=1.906e-08 R2=1.000000 A0=1.000000e-03 A32=6.029981e-04
+  DIAG s=(lambda_A-lambda_B)/(lambda_C-lambda_B) phi0.0000: s=3.0090 (lambda_C-lambda_B)=1.505674e-04
+  DIAG e_IF/e_CB step32 (unnorm L2/256cells): e_IF=1.482978e-04 e_IF_patch=7.933404e-05 e_IF_out=1.252931e-04 e_CB=9.876383e-05 ratio_IF/CB=1.5015
+  DIAG per-cell RMS (uA-uB) step32 phi0.0000: patch=9.9168e-06 (64 cells) outside=9.0422e-06 (192 cells) ratio=1.097 patch_energy_frac=0.2862 (area frac 0.25)
+  DIAG sensors step32: nonmodal(L2/U0)=2.2349e-02 max|uy|/U0=3.6890e-03 max|drho|=3.8401e-06
+  DIAG (uA-uB)_xavg(y) step32 phi0.0000: -2.032e-06 -6.024e-06 -9.820e-06 -1.332e-05 -1.222e-05 -1.167e-05 -8.270e-06 -2.980e-06 2.980e-06 8.270e-06 1.167e-05 1.222e-05 1.332e-05 9.820e-06 6.024e-06 2.032e-06
+  DIAG Pi_xy_mean step32 phi0.0000: B=-1.084202e-19 C=2.168404e-19 (composite=NaN; arrival_f proxy on uniforms)
+  A phi1.5708: lambda=0.01584192 stderr=2.131e-07 R2=1.000000 A0=1.000000e-03 A32=5.989032e-04
+  B phi1.5708: lambda=0.01539917 stderr=3.372e-15 R2=1.000000 A0=1.000000e-03 A32=6.117840e-04
+  C phi1.5708: lambda=0.01554973 stderr=1.906e-08 R2=1.000000 A0=1.000000e-03 A32=6.029981e-04
+  DIAG s=(lambda_A-lambda_B)/(lambda_C-lambda_B) phi1.5708: s=2.9406 (lambda_C-lambda_B)=1.505674e-04
+  DIAG e_IF/e_CB step32 (unnorm L2/256cells): e_IF=1.550631e-04 e_IF_patch=9.195288e-05 e_IF_out=1.248568e-04 e_CB=9.876383e-05 ratio_IF/CB=1.5700
+  DIAG per-cell RMS (uA-uB) step32 phi1.5708: patch=1.1494e-05 (64 cells) outside=9.0108e-06 (192 cells) ratio=1.276 patch_energy_frac=0.3517 (area frac 0.25)
+  DIAG sensors step32: nonmodal(L2/U0)=5.5487e-02 max|uy|/U0=5.0221e-03 max|drho|=4.3542e-06
+  DIAG (uA-uB)_xavg(y) step32 phi1.5708: -9.119e-06 -8.622e-06 -7.886e-06 -7.167e-06 -2.176e-06 6.314e-06 1.264e-05 1.601e-05 1.601e-05 1.264e-05 6.314e-06 -2.176e-06 -7.167e-06 -7.886e-06 -8.622e-06 -9.119e-06
+  DIAG Pi_xy_mean step32 phi1.5708: B=-1.084202e-19 C=2.168404e-19 (composite=NaN; arrival_f proxy on uniforms)
+
+=== PER-TICK AMPLITUDE (selected) ===
+tick           A_p0           B_p0           C_p0          A_p90          B_p90          C_p90          exact
+   0   1.000000e-03   1.000000e-03   1.000000e-03   1.000000e-03   1.000000e-03   1.000000e-03   1.000000e-03
+   1   9.773722e-04   9.860853e-04   9.746265e-04   9.774280e-04   9.860853e-04   9.746265e-04   9.846970e-04
+   2   9.636011e-04   9.710270e-04   9.617788e-04   9.635461e-04   9.710270e-04   9.617788e-04   9.696283e-04
+   3   9.481499e-04   9.561886e-04   9.465229e-04   9.481500e-04   9.561886e-04   9.465229e-04   9.547901e-04
+   4   9.332807e-04   9.415768e-04   9.319786e-04   9.332641e-04   9.415768e-04   9.319786e-04   9.401790e-04
+   8   8.759254e-04   8.853290e-04   8.757728e-04   8.759360e-04   8.853290e-04   8.757728e-04   8.839365e-04
+  12   8.221055e-04   8.324412e-04   8.229603e-04   8.221445e-04   8.324412e-04   8.229603e-04   8.310585e-04
+  16   7.715978e-04   7.827129e-04   7.733326e-04   7.716635e-04   7.827129e-04   7.733326e-04   7.813437e-04
+  20   7.241928e-04   7.359552e-04   7.266976e-04   7.242838e-04   7.359552e-04   7.266976e-04   7.346029e-04
+  24   6.796981e-04   6.919908e-04   6.828749e-04   6.798155e-04   6.919908e-04   6.828749e-04   6.906582e-04
+  28   6.379365e-04   6.506527e-04   6.416948e-04   6.380768e-04   6.506527e-04   6.416948e-04   6.493424e-04
+  32   5.987423e-04   6.117840e-04   6.029981e-04   5.989032e-04   6.117840e-04   6.029981e-04   6.104980e-04
+
+=== NUMERIC SUMMARY ===
+ALL_HARD_CHECKS_PASS=True
+runtime_sec=0.55
+SUMMARY_LINES_BEGIN
+FIT A phi0.0000 lambda=0.0158522189 stderr=8.571672e-08 R2=1.00000000 A0=1.0000000000e-03 A32=5.9874229183e-04
+FIT B phi0.0000 lambda=0.0153991657 stderr=3.372428e-15 R2=1.00000000 A0=1.0000000000e-03 A32=6.1178402808e-04
+FIT C phi0.0000 lambda=0.0155497331 stderr=1.906424e-08 R2=1.00000000 A0=1.0000000000e-03 A32=6.0299811110e-04
+FIT A phi1.5708 lambda=0.0158419175 stderr=2.130663e-07 R2=1.00000000 A0=1.0000000000e-03 A32=5.9890316832e-04
+FIT B phi1.5708 lambda=0.0153991657 stderr=3.372390e-15 R2=1.00000000 A0=1.0000000000e-03 A32=6.1178402808e-04
+FIT C phi1.5708 lambda=0.0155497331 stderr=1.906424e-08 R2=1.00000000 A0=1.0000000000e-03 A32=6.0299811110e-04
+TRANSPOSE err=6.661338e-16 ok=True
+ANALYTIC lambda=0.0154212569
+SUMMARY_LINES_END
@@ -0,0 +1,93 @@
+RECORDER {"started_utc": "2026-10-13T05:02:42.804589+00:00", "cwd": "/home/frank14f/CelerisLab/tests/validation/multigrid", "parent_command": ["env", "OPENBLAS_NUM_THREADS=1", "PYTHONDONTWRITEBYTECODE=1", "PYTHONNOUSERSITE=1", "PYTHONOPTIMIZE=0", "PYTHONPATH=/home/frank14f/CelerisLab/tests/validation/multigrid", "CPU_REFERENCE_PATH=/home/frank14f/CelerisLab/tests/validation/multigrid/cpu_reference.py", "/usr/bin/prlimit", "--as=268435456", "--fsize=2097152", "--core=0", "--", "/home/frank14f/anaconda3/envs/pycuda_3_10/bin/python", "-B", "/home/frank14f/CelerisLab/tests/validation/multigrid/shear_v0_2_evidence/run_once.py"], "script_command": ["/usr/bin/prlimit", "--as=268435456", "--fsize=2097152", "--core=0", "--", "/home/frank14f/anaconda3/envs/pycuda_3_10/bin/python", "-B", "/home/frank14f/CelerisLab/tests/validation/multigrid/shear_diagnostic_v0_2.py"], "environment": {"OPENBLAS_NUM_THREADS": "1", "PYTHONDONTWRITEBYTECODE": "1", "PYTHONNOUSERSITE": "1", "PYTHONOPTIMIZE": "0", "PYTHONPATH": "/home/frank14f/CelerisLab/tests/validation/multigrid", "CPU_REFERENCE_PATH": "/home/frank14f/CelerisLab/tests/validation/multigrid/cpu_reference.py"}, "python_version": "3.10.13 (main, Sep 11 2023, 13:44:35) [GCC 11.2.0]", "numpy_version_from_installed_metadata": "1.26.4", "platform": "Linux-6.8.0-138-generic-x86_64-with-glibc2.35", "hard_limits": {"address_space_bytes": [268435456, 268435456], "output_file_bytes": [2097152, 2097152], "core_bytes": [0, 0]}, "planned_runs": 7, "coarse_steps_per_run": 32, "attempt": 1}
+COMMAND /usr/bin/prlimit --as=268435456 --fsize=2097152 --core=0 -- /home/frank14f/anaconda3/envs/pycuda_3_10/bin/python -B /home/frank14f/CelerisLab/tests/validation/multigrid/shear_diagnostic_v0_2.py
+=== shear_diagnostic_v0.2 against CPUREF-0.3 ===
+REF_PATH=/home/frank14f/CelerisLab/tests/validation/multigrid/cpu_reference.py
+REF_SHA256=bba2a06a9f6517b32079ffff15e4060d8c3b7ed35f16ca134e1877226c9e4e1e
+API_VERSION=CPUREF-0.3
+U0=0.001 tau_c=0.8 tau_f=1.1 steps=32 nu=0.1 k=0.39269908169872414
+nu*k^2=0.01542126  (analytic decay rate)
+INIT: equilibrium of averaged velocity (NOT exact cell-avg of nonlinear feq)
+UNITS: fit/report 'steps' are coarse steps; CPUREF tick = fine step count
+  fit window coarse steps 4..32 = CPUREF ticks 8..64
+  startup coarse steps 0..3 = CPUREF ticks 0..6
+  nonmodal/e_IF/e_CB are unnormalised L2 sums over 256 coarse cells
+  (per-cell RMS = value/16); nonmodal is already /U0
+CONS_TOL=1e-12 relative to mass (~256) => abs ~2.560e-10
+
+-- running C (uniform-coarse) phi0.0000
+-- running B (uniform-fine) phi0.0000
+-- running A (composite CPUREF) phi0.0000
+-- running C (uniform-coarse) phi1.5708
+-- running B (uniform-fine) phi1.5708
+-- running A (composite CPUREF) phi1.5708
+-- running A transpose phi=1.5707963267948966
+
+=== HARD CHECKS ===
+  finite[A_phi0.0000]=True cons=True mass_drift=5.969e-13 momx_drift=1.690e-13 momy_drift=2.753e-14 tol_abs=2.560e-10 (CONS_TOL*mass=1e-12*|256|) init_rho_j_mismatch_vs_coarse_formula=1.110e-16
+  finite[B_phi0.0000]=True cons=True mass_drift=7.105e-13 momx_drift=2.970e-15 momy_drift=3.553e-15 tol_abs=2.560e-10 (CONS_TOL*mass=1e-12*|256|) 
+  finite[C_phi0.0000]=True cons=True mass_drift=4.547e-13 momx_drift=4.607e-15 momy_drift=6.495e-15 tol_abs=2.560e-10 (CONS_TOL*mass=1e-12*|256|) 
+  finite[A_phi1.5708]=True cons=True mass_drift=8.242e-13 momx_drift=1.033e-13 momy_drift=9.015e-14 tol_abs=2.560e-10 (CONS_TOL*mass=1e-12*|256|) init_rho_j_mismatch_vs_coarse_formula=1.110e-16
+  finite[B_phi1.5708]=True cons=True mass_drift=6.821e-13 momx_drift=2.970e-15 momy_drift=3.553e-15 tol_abs=2.560e-10 (CONS_TOL*mass=1e-12*|256|) 
+  finite[C_phi1.5708]=True cons=True mass_drift=4.547e-13 momx_drift=4.607e-15 momy_drift=6.495e-15 tol_abs=2.560e-10 (CONS_TOL*mass=1e-12*|256|) 
+  finite[A_T_phi1.5708]=True cons=True mass_drift=7.105e-13 momx_drift=1.843e-14 momy_drift=6.062e-14 tol_abs=2.560e-10 (CONS_TOL*mass=1e-12*|256|) init_rho_j_mismatch_vs_coarse_formula=1.110e-16
+  transpose_ok=True max_err=6.661e-16 (tol=1.000e-15)
+  t0 amp A/B/C phi0.0000: 1.00000000e-03 1.00000000e-03 1.00000000e-03
+  t0 max|ux A-B| patch=1.084e-19  |A-C| outside=2.168e-19  |B-C| all=6.245e-17
+  t0_AB_patch_ok=True t0_AC_out_ok=True (T0_TOL=1.0e-15)  init_mismatch=1.110e-16 ok=True (INIT_TOL=1.0e-12)
+  t0 amp A/B/C phi1.5708: 1.00000000e-03 1.00000000e-03 1.00000000e-03
+  t0 max|ux A-B| patch=1.084e-19  |A-C| outside=2.168e-19  |B-C| all=6.245e-17
+  t0_AB_patch_ok=True t0_AC_out_ok=True (T0_TOL=1.0e-15)  init_mismatch=1.110e-16 ok=True (INIT_TOL=1.0e-12)
+  init_mismatch[A_T]=1.110e-16 ok=True (INIT_TOL=1.0e-12)
+  N_BOOLEAN_HARD_CHECKS=22: cons_A_T_phi1.5708,cons_A_phi0.0000,cons_A_phi1.5708,cons_B_phi0.0000,cons_B_phi1.5708,cons_C_phi0.0000,cons_C_phi1.5708,finite_A_T_phi1.5708,finite_A_phi0.0000,finite_A_phi1.5708,finite_B_phi0.0000,finite_B_phi1.5708,finite_C_phi0.0000,finite_C_phi1.5708,init_mismatch_ok_A_T_phi1.5708,init_mismatch_ok_phi0.0000,init_mismatch_ok_phi1.5708,t0_AB_patch_ok_phi0.0000,t0_AB_patch_ok_phi1.5708,t0_AC_out_ok_phi0.0000,t0_AC_out_ok_phi1.5708,transpose_ok
+
+=== DECAY FITS (coarse steps 4..32 = CPUREF ticks 8..64) ===
+  analytic lambda = nu*k^2 = 0.01542126
+  A phi0.0000: lambda=0.01585222 stderr=8.572e-08 R2=1.000000 A0=1.000000e-03 A32=5.987423e-04
+  B phi0.0000: lambda=0.01539917 stderr=3.372e-15 R2=1.000000 A0=1.000000e-03 A32=6.117840e-04
+  C phi0.0000: lambda=0.01554973 stderr=1.906e-08 R2=1.000000 A0=1.000000e-03 A32=6.029981e-04
+  DIAG s=(lambda_A-lambda_B)/(lambda_C-lambda_B) phi0.0000: s=3.0090 (lambda_C-lambda_B)=1.505674e-04
+  DIAG e_IF/e_CB step32 (unnorm L2/256cells): e_IF=1.482978e-04 e_IF_patch=7.933404e-05 e_IF_out=1.252931e-04 e_CB=9.876383e-05 ratio_IF/CB=1.5015
+  DIAG per-cell RMS (uA-uB) step32 phi0.0000: patch=9.9168e-06 (64 cells) outside=9.0422e-06 (192 cells) ratio=1.097 patch_energy_frac=0.2862 (area frac 0.25)
+  DIAG sensors step32: nonmodal(L2/U0)=2.2349e-02 max|uy|/U0=3.6890e-03 max|drho|=3.8401e-06
+  DIAG (uA-uB)_xavg(y) step32 phi0.0000: -2.032e-06 -6.024e-06 -9.820e-06 -1.332e-05 -1.222e-05 -1.167e-05 -8.270e-06 -2.980e-06 2.980e-06 8.270e-06 1.167e-05 1.222e-05 1.332e-05 9.820e-06 6.024e-06 2.032e-06
+  DIAG Pi_xy_mean step32 phi0.0000: B=-1.084202e-19 C=2.168404e-19 (composite=NaN; arrival_f proxy on uniforms)
+  A phi1.5708: lambda=0.01584192 stderr=2.131e-07 R2=1.000000 A0=1.000000e-03 A32=5.989032e-04
+  B phi1.5708: lambda=0.01539917 stderr=3.372e-15 R2=1.000000 A0=1.000000e-03 A32=6.117840e-04
+  C phi1.5708: lambda=0.01554973 stderr=1.906e-08 R2=1.000000 A0=1.000000e-03 A32=6.029981e-04
+  DIAG s=(lambda_A-lambda_B)/(lambda_C-lambda_B) phi1.5708: s=2.9406 (lambda_C-lambda_B)=1.505674e-04
+  DIAG e_IF/e_CB step32 (unnorm L2/256cells): e_IF=1.550631e-04 e_IF_patch=9.195288e-05 e_IF_out=1.248568e-04 e_CB=9.876383e-05 ratio_IF/CB=1.5700
+  DIAG per-cell RMS (uA-uB) step32 phi1.5708: patch=1.1494e-05 (64 cells) outside=9.0108e-06 (192 cells) ratio=1.276 patch_energy_frac=0.3517 (area frac 0.25)
+  DIAG sensors step32: nonmodal(L2/U0)=5.5487e-02 max|uy|/U0=5.0221e-03 max|drho|=4.3542e-06
+  DIAG (uA-uB)_xavg(y) step32 phi1.5708: -9.119e-06 -8.622e-06 -7.886e-06 -7.167e-06 -2.176e-06 6.314e-06 1.264e-05 1.601e-05 1.601e-05 1.264e-05 6.314e-06 -2.176e-06 -7.167e-06 -7.886e-06 -8.622e-06 -9.119e-06
+  DIAG Pi_xy_mean step32 phi1.5708: B=-1.084202e-19 C=2.168404e-19 (composite=NaN; arrival_f proxy on uniforms)
+
+=== PER-TICK AMPLITUDE (selected) ===
+tick           A_p0           B_p0           C_p0          A_p90          B_p90          C_p90          exact
+   0   1.000000e-03   1.000000e-03   1.000000e-03   1.000000e-03   1.000000e-03   1.000000e-03   1.000000e-03
+   1   9.773722e-04   9.860853e-04   9.746265e-04   9.774280e-04   9.860853e-04   9.746265e-04   9.846970e-04
+   2   9.636011e-04   9.710270e-04   9.617788e-04   9.635461e-04   9.710270e-04   9.617788e-04   9.696283e-04
+   3   9.481499e-04   9.561886e-04   9.465229e-04   9.481500e-04   9.561886e-04   9.465229e-04   9.547901e-04
+   4   9.332807e-04   9.415768e-04   9.319786e-04   9.332641e-04   9.415768e-04   9.319786e-04   9.401790e-04
+   8   8.759254e-04   8.853290e-04   8.757728e-04   8.759360e-04   8.853290e-04   8.757728e-04   8.839365e-04
+  12   8.221055e-04   8.324412e-04   8.229603e-04   8.221445e-04   8.324412e-04   8.229603e-04   8.310585e-04
+  16   7.715978e-04   7.827129e-04   7.733326e-04   7.716635e-04   7.827129e-04   7.733326e-04   7.813437e-04
+  20   7.241928e-04   7.359552e-04   7.266976e-04   7.242838e-04   7.359552e-04   7.266976e-04   7.346029e-04
+  24   6.796981e-04   6.919908e-04   6.828749e-04   6.798155e-04   6.919908e-04   6.828749e-04   6.906582e-04
+  28   6.379365e-04   6.506527e-04   6.416948e-04   6.380768e-04   6.506527e-04   6.416948e-04   6.493424e-04
+  32   5.987423e-04   6.117840e-04   6.029981e-04   5.989032e-04   6.117840e-04   6.029981e-04   6.104980e-04
+
+=== NUMERIC SUMMARY ===
+ALL_HARD_CHECKS_PASS=True
+runtime_sec=2.07
+SUMMARY_LINES_BEGIN
+FIT A phi0.0000 lambda=0.0158522189 stderr=8.571672e-08 R2=1.00000000 A0=1.0000000000e-03 A32=5.9874229183e-04
+FIT B phi0.0000 lambda=0.0153991657 stderr=3.372428e-15 R2=1.00000000 A0=1.0000000000e-03 A32=6.1178402808e-04
+FIT C phi0.0000 lambda=0.0155497331 stderr=1.906424e-08 R2=1.00000000 A0=1.0000000000e-03 A32=6.0299811110e-04
+FIT A phi1.5708 lambda=0.0158419175 stderr=2.130663e-07 R2=1.00000000 A0=1.0000000000e-03 A32=5.9890316832e-04
+FIT B phi1.5708 lambda=0.0153991657 stderr=3.372390e-15 R2=1.00000000 A0=1.0000000000e-03 A32=6.1178402808e-04
+FIT C phi1.5708 lambda=0.0155497331 stderr=1.906424e-08 R2=1.00000000 A0=1.0000000000e-03 A32=6.0299811110e-04
+TRANSPOSE err=6.661338e-16 ok=True
+ANALYTIC lambda=0.0154212569
+SUMMARY_LINES_END
+
+RUN_RESULT {"started_utc": "2026-10-13T05:02:42.804589+00:00", "cwd": "/home/frank14f/CelerisLab/tests/validation/multigrid", "parent_command": ["env", "OPENBLAS_NUM_THREADS=1", "PYTHONDONTWRITEBYTECODE=1", "PYTHONNOUSERSITE=1", "PYTHONOPTIMIZE=0", "PYTHONPATH=/home/frank14f/CelerisLab/tests/validation/multigrid", "CPU_REFERENCE_PATH=/home/frank14f/CelerisLab/tests/validation/multigrid/cpu_reference.py", "/usr/bin/prlimit", "--as=268435456", "--fsize=2097152", "--core=0", "--", "/home/frank14f/anaconda3/envs/pycuda_3_10/bin/python", "-B", "/home/frank14f/CelerisLab/tests/validation/multigrid/shear_v0_2_evidence/run_once.py"], "script_command": ["/usr/bin/prlimit", "--as=268435456", "--fsize=2097152", "--core=0", "--", "/home/frank14f/anaconda3/envs/pycuda_3_10/bin/python", "-B", "/home/frank14f/CelerisLab/tests/validation/multigrid/shear_diagnostic_v0_2.py"], "environment": {"OPENBLAS_NUM_THREADS": "1", "PYTHONDONTWRITEBYTECODE": "1", "PYTHONNOUSERSITE": "1", "PYTHONOPTIMIZE": "0", "PYTHONPATH": "/home/frank14f/CelerisLab/tests/validation/multigrid", "CPU_REFERENCE_PATH": "/home/frank14f/CelerisLab/tests/validation/multigrid/cpu_reference.py"}, "python_version": "3.10.13 (main, Sep 11 2023, 13:44:35) [GCC 11.2.0]", "numpy_version_from_installed_metadata": "1.26.4", "platform": "Linux-6.8.0-138-generic-x86_64-with-glibc2.35", "hard_limits": {"address_space_bytes": [268435456, 268435456], "output_file_bytes": [2097152, 2097152], "core_bytes": [0, 0]}, "planned_runs": 7, "coarse_steps_per_run": 32, "attempt": 1, "returncode": 0, "elapsed_seconds": 2.2370318549801596, "child_peak_rss_MiB": 37.69140625, "parent_peak_rss_MiB": 18.75, "completed_utc": "2026-10-13T05:02:45.056308+00:00"}