test(producer): regenerate 7 stale regression baselines (#946)

## Summary

- Regenerate golden baselines for 7 regression tests that were deterministically failing due to stale baselines from before the recent renderer fixes
- Root cause: renderer changes (revert flattenInnerRoot, late-bind polling removal, conditional rebind, sub-comp timeline readiness polling) changed visual output, but baselines were never regenerated
- CI's `Detect changes` job was skipping shards on non-engine commits, masking the failures — making it look like flaky tests when in reality they failed every time shards ran

## Tests regenerated (all in Docker with pinned Chrome 148.0.7778.167)

| Test | Previously failed frames | Baseline age |
|---|---|---|
| `gsap-letters-render-compat` | 86/100 | old |
| `typegpu-adapter` | 76/100 | May 13 |
| `style-7-prod` | 60/100 | PR #368 (very old) |
| `style-15-prod` | 59/100 | May 17 (pre-renderer-fixes) |
| `style-18-prod` | 19/100 | old |
| `style-3-prod` | 7/100 | May 17 (pre-renderer-fixes) |
| `style-8-prod` | 1/100 | borderline |

## Test plan

- [x] All 7 tests pass locally in Docker with 0 failed frames
- [x] Verified deterministic — ran style-7-prod twice, same result both times
- [x] All 8 CI regression shards green
- [x] Other tests (style-1, 2, 4, 5, 6, 9, 10, 11, 12, 13, 16, 17, overlay-montage, sub-composition-video, vignelli-stacking, etc.) still pass

🤖 Generated with [Claude Code](https://claude.com/claude-code)

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