* fix(exit): stop running jobs before Python joins the executor threads (#376)
ComfyUI returns from main.py after Ctrl+C without closing its event loop,
and Python joins every executor thread before any atexit callback runs, so
a scan batch, thumbnail batch or model download in flight kept ComfyUI
alive until it ended (on Windows each ffmpeg up to its 30 s timeout).
The package now registers a threading._register_atexit hook (after
concurrent.futures', so it runs before that join) that sets an exit signal
and kills the running encoder processes. Job.cancelled follows the signal,
so every check a job already makes between files stops it at exit;
map_parallel starts no further item, the scan walk stops between folders and
a tagging model download stops before its next chunk. Without the internal
hook exit behaves as before.
* fix(exit): abort Xet downloads and stop LoRA staging at exit (#376)
Review follow-ups: Xet transfers report progress from native code and ignore
the chunk checkpoint, so the exit hook calls huggingface_hub's own
abort_xet_session when it is loaded; an aborted download logs as stopped.
LoRA import staging reads the exit signal itself, so the legacy LoRA scan
stops too. The test's fake encoder outlives the ceiling by less, and
TESTING.md states the download limits of older huggingface_hub.
Vito
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