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test: adopt native-validated 24-target probe layout

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Horizontal y=56 and vertical x=38 through box 1, normal coordinates
[12.5..26.125] (root128 physical). Nearest-ACTIVE mapping with
deterministic tie rule (distance, finer level, smaller j, smaller i),
duplicate-cell rejection, stored centers and displacements. Replaces my
earlier offsets, which mapped two target pairs to the same U128 cell.
U512 spacing 128/512 and root step r -> U512 step 4r unchanged.
Tests: 24 unique cells per case, nested 3 L0 + 5 L1 + 4 L2 per transect,
U128 max displacement 0.625.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
This commit is contained in:
Claude
2026-10-19 03:13:43 +00:00
co-authored by Claude Opus 5.5
parent 1e188e7419
commit caa573f978
4 changed files with 63 additions and 42 deletions
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docs/validation/taylor_green.md
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@@ -421,12 +421,18 @@ Labels:
### Signed interface-probe traces (opt-in `--probe-trace`, mechanism diagnostic)
`shear_probes.py` (pinned) defines 24 fixed points on two interface-normal
transects, all at least 8 root cells from any box corner:
- V: y = 64.1, crossing the vertical faces x = 16 (L0/L1) and x = 22 (L1/L2);
- H: x = 90.1, crossing the horizontal faces y = 24 and y = 30;
- offsets from the outer face: −3.9, −1.9, −0.4, 0.1, 0.6, 2.1, 4.1, 5.6, 6.1,
6.6, 8.1, 10.1.
`shear_probes.py` (pinned) uses native's validated 24-target layout through
box 1, in root-128 physical coordinates:
- a horizontal line y = 56, crossing the vertical faces x = 16 and 22;
- a vertical line x = 38, crossing the horizontal faces y = 16 and 22;
- normal coordinates 12.5, 14.5, 15.5, 16.25, 17.25, 19.25, 20.75, 21.75,
22.125, 23.125, 24.125, 26.125.
Each target maps to the nearest ACTIVE leaf center. The deterministic tie
rule is: distance, then finer level, then smaller j, then smaller i. This
gives 24 unique cells in every case, and nested has 3 L0 + 5 L1 + 4 L2 per
transect. Maximum displacement from target to center is 0.625 root cells in
U128 (0.177 in U512).
Allowed cases:
- nested U128, nested U512, nested projected depth 3;
@@ -435,9 +441,8 @@ Allowed cases:
The option can't be combined with `--final-snapshot`.
Sampling:
- Each point is read from the ACTIVE leaf cell containing it. The receipt
stores the leaf level, `i`/`j`, and the actual cell center, all in
root-physical units (N=128).
- The receipt stores each probe's leaf level, `i`/`j`, actual cell center
and displacement from its target, all in root-physical units (N=128).
- Grids differ between cases, so centers are *not* collocated. Analytic
fields are evaluated at each actual center (`shear_probes.residuals`), and
comparisons across cases are between residuals at nearby but distinct