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Miguel Ángel
bcd7230557
## Summary - **Root cause**: `shouldFallbackToScreenshotAfterCalibrationError` only matched `HeadlessExperimental.beginFrame` errors. When a composition with many heavy videos (e.g. 7 videos with sparse keyframes) caused Chrome to be unresponsive in BeginFrame mode during calibration, a `Runtime.callFunctionOn timed out` or `Runtime.evaluate timed out` error was treated as an opaque failure — not a BeginFrame-mode signal. The render kept BeginFrame mode, spawned 3 workers with `captureCostMultiplier=8`, and all 3 workers also timed out initialising their sessions (0 frames captured, render fails). - **Fix**: Add `Runtime.callFunctionOn timed out` and `Runtime.evaluate timed out` to the screenshot-fallback pattern. Any CDP call timing out during the short-timeout calibration probe now routes the render into single-worker screenshot mode — the safe fallback already used for explicit BeginFrame timeouts. - **Result**: Compositions that overwhelm BeginFrame mode (reported in #566: 7 videos, 8 audios, 330-second render) now fall back cleanly and complete instead of failing with 0 frames. ## Test plan - [x] New unit test: `falls back to screenshot mode after Runtime.callFunctionOn timeout during calibration` — asserts both `Runtime.callFunctionOn timed out` and `Runtime.evaluate timed out` return `true` - [x] All existing `capture calibration safeguards` unit tests still pass - [x] Pre-commit hooks (lint, format, typecheck) pass Fixes #566