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hyperframes/packages
Vance Ingalls 60f4ebbf13 test(hdr-regression): tighten Window C maxFrameFailures budget after Chunk 1 fix (#369)
## Summary

Tighten `hdr-regression` Window C `maxFrameFailures` from 30 → 5 now that Chunk 1 (opacity pipeline) has landed.

## Why

Window C (direct `<video>` opacity tween) was previously listed as a known failure with a `maxFrameFailures` budget of 30 to absorb expected drift until Chunk 1 landed. After the Chunk 1 fix, the regression test passes against the existing golden with **0 failed frames**. Tightening the budget catches any future drift in the opacity path immediately rather than letting up to 30 broken frames slip through.

## What changed

- `tests/hdr-regression/meta.json`: `maxFrameFailures` 30 → 5 (small budget remains for HEVC encoder noise).
- `tests/hdr-regression/README.md`: updated to mark Window C as fixed and note the tightened budget.

The HEVC encoder is byte-deterministic and the opacity fix doesn't perturb pixels at the PSNR ≥ 28 checkpoint threshold, so regenerating the golden produces byte-identical output. The golden is therefore unchanged. Window F (transform + border-radius) remains pending Chunk 4; its broken state is currently baked into the golden, so the suite is green and Chunk 4's regen will catch any drift.

## Test plan

- [x] `bun run test --filter hdr-regression` — passes with 0 failed frames at the new budget.

## Stack

Follow-up to Chunk 1 (opacity pipeline). Reviewable separately so the golden churn (none in this case) is decoupled from the code fix.
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