Add script-to-beats compiler for continuous video episodes - #6229
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Pure module that partitions a scene script into beat-level video clip specs: word-count-driven duration snapped to a target frame grid (uniform or the MiniMax H3 family's 17n+5 grid), byte-stable bible descriptor injection for cast/locations/style, explicit speaker-clause dialogue formatting, and a max-chain-length rule that forces a fresh re-establish cut every N clips. First slice of the continuous-video episode feature (#6217); the prompt linter (#6226) and orchestrator (#6227) build on this.
Copy the beat speaker array before handing it out on a clip spec (the source array is shared with partitionLinesIntoBeats' internal beat object), and replace the O(n^2) per-line beatWordCount rescan with a running word counter.
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Summary
server/lib/scriptVideoCompiler.js: a pure module that partitions a scene script into beat-level clip specs for chained/continuous video generation.S1 (Speaker, voice): "..."clauses.server/libbarrel + README per the module-organization convention.First slice of the continuous-video-episode epic (#6217) — the prompt linter (#6226) and orchestrator (#6227) build on this.
Test plan
cd server && npx vitest run lib/scriptVideoCompiler.test.js— 16 new unit tests covering beat partitioning, frame-grid snapping (both grids), dialogue formatting, byte-identical descriptor reuse, and the chain-length/scene-boundary fresh-cut rules.cd server && npx vitest run lib/index.test.js— barrel/README registration guard.cd server && npx vitest run lib/— fullserver/libsuite (467 files, 10522 tests) green.opencodeagainst the branch diff; findings applied (cloned the shared speaker array before returning it on a clip spec, replaced an O(n²) per-line word rescan with a running counter).Closes #6225