- Web Worker routing — A* search runs in a background Worker thread,
keeping the UI responsive during large batch routes
- Worker watchdog — auto-falls back to main-thread routing on any failure
- Worker held-pause — drag-pause re-routes also run in worker
- stretch.js — extracted sticky-path logic, shared by main thread and worker
- Profiler disk export — POST /linkrouter/write_log endpoint saves reports
- Chunked worker processing — 8ms macrotask slices for cancel responsiveness
- New settings: Background worker routing, Held-pause in worker
90-RED
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