Preserve bounded validation evidence and historical failures
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Local-stress observable v1 — Horsea review and single-run handoff
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2026-10-13, Asia/Shanghai. Observation-only; reference unchanged.
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Actual result
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Exactly one execution of the delivered script: 7 runs x 32 coarse steps, exit 0.
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Original 22 Boolean hard checks plus 7 stress-finite checks: all 29 pass.
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Both ALL_HARD_CHECKS_PASS_V02 and ALL_HARD_CHECKS_PASS_WITH_STRESS are True.
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No retries, added cases, modified formulas, relaxed tolerances or new R thresholds.
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Review status (separate from numerical results)
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Grok authored the implementation and ran it in an independent environment.
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The coordinating root reported an independent static review with no substantive
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issue. Claude's implementation-code review is paused due to an API error and
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has NOT completed. Claude's earlier specification discussion and the table's
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"implicit-definition checks" do not constitute a completed code review.
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Horsea read all 902 script lines, original stdout, table and manifest, reviewed
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the related reference paths and local reference sources below, and found no
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substantive numerical objection blocking this bounded diagnostic rerun.
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Scope and static review
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Applied .github/skills/lbm-ref-architecture-guard/SKILL.md and its reference/
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architecture checklists. No applicable ancestor AGENTS.md was found.
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The incoming script is standalone NumPy+stdlib, with no runtime dependency on
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the previous shear script. Its original bytes are preserved. Architecture:
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main -> run_uniform(B/C) / run_composite(A/A_T) -> arrival populations ->
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sigma_xy_cell -> level-specific sigma restriction -> Fourier R and profiles.
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The composite advance uses the existing CPUREF-0.3 API without wrapping or
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changing its algorithm. The external recorder pins the reference before import;
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the diagnostic's printed REF_SHA_MATCH alone would not enforce that pin.
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Reference findings (read-only, no imported reference packages)
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1. ref/lbmpy/src/lbmpy/macroscopic_value_kernels.py, strain_rate_tensor_getter:
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the second moment is formed from f minus equilibrium; S=-3*omega*Pi/(2*rho).
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2. ref/OpenLB/src/functors/lattice/latticePhysStrainRate2D.hh independently uses
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the negative nonequilibrium-moment sign and omega/(2*rho*cs^2*dt) conversion.
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3. ref/lbmpy/src/lbmpy/relaxationrates.py gives nu=(tau-.5)/3. Combining
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sigma=2*rho*nu*S yields -(1-1/(2*tau))*Pi_neq in lattice units.
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4. ref/OpenLB/src/core/unitConverter.h converts viscosity by dx^2/dt and
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pressure/stress by density*(dx/dt)^2. Here dx/dt=1 on both levels and density
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units match, so no additional scale factor belongs in this observation.
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5. Existing cpu_reference.py: paired D2Q9 ordering, physical patch offset,
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acoustic tau scaling, arrival_f input/output, tick increment 2, and owned
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leaf-cell masks. The pinned full reference was reviewed in the prior round;
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this review reread its maps, collision/explosion, leaf totals and advance path.
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Verified definitions
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Initialization remains equilibrium of the exact cell-average sine velocity,
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not exact cell averages of nonlinear f_eq. Fine coordinates include patch offset.
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All final observations use coarse step 32: composite arrival_f tick=64,
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uniform B after 64 collide-stream substeps and C after 32. No extra collision.
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Pi_xy^neq=sum(cx*cy*f)-rho*ux*uy is evaluated per owned cell. Each level applies
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its own tau to obtain sigma BEFORE 2x2 volume averaging. Covered coarse values
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and fine ghosts are excluded. Velocity restriction averages rho/j before u=j/rho.
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R uses a_u=(2/256)*sum(u*sin) from the same run and final arrival state, not an
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analytic decay amplitude. This raw Fourier coefficient includes the cell-average
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sinc factor; the old decay fit amplitude uses its sinc-normalized template.
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The cosine stress projection and velocity projection use a common 16x16 grid.
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Signed horizontal profiles average columns 4:12 and retain all 16 rows; rows
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3,4,11,12 flank the patch faces. The transposed case reports R only, no profile.
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Runtime evidence
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Existing Python 3.10.13 / NumPy 1.26.4, CPU only. run_once.py is a standalone
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stdlib recorder derived from the previous recorder; it does not execute or
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import the prior diagnostic. It checks all four delivered file hashes, the tar
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hash and reference hash before launch, and refuses existing logs/results.
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Parent and child both used /usr/bin/prlimit with soft=hard bounds:
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--as=268435456 --fsize=2097152 --core=0
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Process-only OPENBLAS_NUM_THREADS=1, PYTHONDONTWRITEBYTECODE=1,
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PYTHONNOUSERSITE=1, PYTHONOPTIMIZE=0; PYTHONPATH is only the current multigrid
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directory. CPU_REFERENCE_PATH explicitly selects its cpu_reference.py.
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results_horsea.json and stdout_horsea.txt retain full argv, environment, cwd,
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preflight SHA values, versions, times, exit status and measured RSS.
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UTC start/end: 2026-10-13 06:01:08.222086 / 06:01:10.671541
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Local start/end: 14:01:08 / 14:01:10 Asia/Shanghai.
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Child elapsed 2.435032 s; peak RSS 38.41796875 MiB; parent peak 18.75 MiB.
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Combined stdout/stderr with recorder metadata: 17091 bytes, below 2 MiB.
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Grok and prior-result comparison
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comparison.json parses each of the 29 Boolean checks, the original 22 names,
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both all-pass markers, R values, ratios and every profile value. HARD CHECKS,
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STRESS FINITE CHECKS, SUMMARY_LINES and DECAY FITS blocks all match Grok
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exactly at printed precision. All recorded numeric differences are zero.
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The ten profile rows in SUMMARY_LINES contain 160 scalar entries total.
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Six current lambda values also match the prior local shear output at 8 decimal
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places (the precision emitted by this script). Prior 10-decimal values are
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retained in the comparison for provenance, not claimed freshly measured here.
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Full stdout hashes need not match across machines; paths, runtime and recorder
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metadata differ. Printed equality is not full-precision field equality.
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R at coarse step 32 (diagnostic only):
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phi0: A=1.011774619306 B=.998555854025 C=1.008383635570
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phiPi/2: A=1.011850480751 B=.998555854025 C=1.008383635570
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A_T: 1.011850480751
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Interpretation limits (separate from pass/fail checks)
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The retained transpose assertion covers u/rho, not stress. R_A_T agreeing with
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R_A at phiPi/2 is a reported observation, NOT a new stress-transpose hard test.
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Seven finite-stress checks do not establish local stress accuracy, convergence,
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interface stress-transfer correctness or any causal mechanism. One resolution,
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tau pair, patch and short window remain in scope. Composite conservation uses
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the reference leaf-total helper; this is not a new independent conservation
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oracle. Time-held ghosts and unscaled nonequilibrium transfer remain candidate,
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non-exhaustive explanations. No time-interpolated ghosts were implemented.
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Frozen state and handoff
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baseline.json froze HEAD, Git status and 292 old-file hashes, including all
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previous CPUREF/shear evidence. Its stated hash scope excludes the read-only
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ref tree, symlinks and bytecode. Final manifest.json verifies the frozen files,
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original inputs and reference, and lists new paths/bytes/SHA256; its own SHA is
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reported in the handoff. Only this evidence directory and the delivered
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local_stress_observable_v1.py were added. No production imports, GPU/solver
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runs, installs, environment/SSH/system changes, DynamisLab access, commit or push.
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Stopped here for joint acceptance; Claude code review remains outstanding.
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User authorization evidence, verbatim as relayed by the coordinating thread
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<transcript_evidence>
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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。
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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。
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user（Sentinel_d0d3a42b2c088191aa8aebc105fb1b27）: 允许，你用GPU验证都行
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</transcript_evidence>
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The coordinating instruction narrows this run to CPU observation-only. Future
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GPU work was not performed or specified here; this is not unrestricted remote
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operation authorization. Input transfer was already complete when received.
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