Worker prewarm, viewport-first stable batches, and adaptive reveal pacing
(default on, clamp 6–14ms). On drag settle force OVG rebuild and never drop
the last legal path when route/stretch fail.
- 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