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Address @vanceingalls and @miguel-heygen review findings on #852: 1. Asymmetric soft-skip — only the N=1 plan+render+assemble call was wrapped in the host-Chrome-failure catch; an SwiftShader / cold-Chrome flake on the N=4 call would hard-fail instead of soft-skip. Factor a local runRender() helper and wrap both calls. 2. Vacuously-passing length assertion — 'expect(framesOne.length).toBe( framesFour.length)' passes when both runs produce 0 frames. Pin the absolute count (EXPECTED_FRAME_COUNT = 60) so a regression that identically truncates both renders shows red. 3. CDN version drift — anime-boundary loaded gsap@3.14.2 from jsdelivr while every other boundary fixture loaded 3.12.2 from cdnjs. Unify on cdnjs@3.12.2 so the next reader doesn't have to wonder why one fixture diverges. (gsap is an empty duration-driver in all six fixtures so the version was never load-bearing — but the divergence reads as intentional and isn't.) 4. VIDEO_EXT type narrowing — the lookup is Record<"mp4"|"mov"|"webm"> but outputFormat includes "png-sequence". The isPngSequence ternary short-circuits before png-sequence can reach the indexing site, but TS can't narrow through that. Add an explicit cast at the indexing site (not the lookup definition — over-widening to include "png-sequence": undefined would defeat the existence guarantee). 🤖 Generated with [Claude Code](https://claude.com/claude-code)