root 215503a6d4 Fix compute verifier FP tolerance and add health tooling ...

- FP tolerance: iters/3 + 2 ULP (23 for default 64 iters) to account for
  CPU vs GPU FMA rounding accumulation in chained operations. Integer
  comparison remains exact.
- Verified: 100M checks, zero errors on both boards at 40 CU.
- Added cu_map.sh health overlay, CU health test, selective masking tool.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

2026-05-18 21:41:22 +00:00

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