perf(studio): find timeline transition seams once per track, not once per row #17339

Job	Run time
Semantic PR title	5s
Format	56s
Test reachability	33s
Detect changes	19s
File size check	18s
Fallow audit	38s
Typecheck	3m 38s
Build	3m 36s
Lint	44s
Test: runtime contract	1m 54s
SDK: unit + contract + smoke	38s
Test (studio)	5m 45s
Test (runtime)	3m 32s
Producer: unit tests	1m 29s
Test (support)	2m 34s
Studio: load smoke	1m 18s
Studio: timeline viewport gate	1m 30s
Producer: integration tests	2m 46s
CLI smoke (required)	4m 29s
Test: skill bootstrap (Windows, Node 24)	0s
Skills: project-native lint + mirror	0s
Skills: manifest in sync	0s
CLI: npx shim (${{ matrix.os }})	0s
GCP BeginFrame image contract	0s
Catalog payloads	0s
Test: skills	0s
Codex plugin package	0s
Catalog: search index covers the registry	0s
Smoke: global install	2m 42s
Test	3s
	39m 27s

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