Perf/segment pipeline in worker#10
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…cking) Previously only per-tile inference ran in the worker; preprocess, tile averaging, and flow dynamics ran on the main thread and froze the UI (the 'suddenly returns' stall before results). Add a 'segment' worker message that runs the entire pipeline off-thread — preprocess -> tile -> inference -> average -> dynamics -> inverse-resize — and posts back only the final label map (transferred). segment() now drives that path; per-tile inference progress is still surfaced via onTileProgress. The legacy run-tile message is retained. The image is structured-cloned to the worker (left intact for the caller); the result masks are transferred back. Per-tile flow tensors stay in the worker, so SegmentOutput.tiles[].flows_cellprob is now empty (timing diagnostics kept). typecheck + lint clean; 61 vitest tests pass (dynamics parity IoU 1.000); build ok.
- README: the whole pipeline (preprocess → inference → averaging → dynamics → resize) now runs in the Web Worker via the 'segment' message; the UI never blocks. Updated the Highlights, Status, Architecture section, and the quickstart note that SegmentOutput.tiles[].flows_cellprob is now empty (flow tensors stay in the worker). Dropped a couple of stale test counts. - CHANGELOG: added an Unreleased entry (Changed + Removed).
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