* feat(git-status): batch, cancel, and cache git status polling to cut idl
- Add a single duty-cycled refresh scheduler (activity debounce + 60s
safety timer) replacing multiple overlapping intervals, so status
polling no longer runs near-continuously on large repos (#7983).
- Let safety refreshes reuse cached numstat line counts instead of
re-running diff --numstat every cycle, invalidated by head change,
known mutations, and a bounded TTL.
- Thread AbortSignal/request-token cancellation through IPC, RPC, and
relay layers so a superseded or backgrounded git:status call is
killed instead of finishing wastefully.
- Fix automatic upstream/status apply ordering so a slow, older
refresh can no longer clobber a newer result, and so an earlier
refresh still applies when a later one fails.
* Fix aborted git status scans being mistaken for completed empty results
- An aborted scan/numstat pass now always rejects instead of silently
resolving, so a cancelled request can't look like a valid empty status.
- Stop clearing the line-stats cache key on abort, since an aborted pass
never wrote to it — clearing was evicting a concurrent scan's healthy
snapshot and forcing a redundant numstat recompute.
* Fix aborted git status scans resolving as completed results
Cancelled scans could still resolve with partial or stale data instead of
rejecting, letting callers treat an aborted refresh as a valid status. Also
stop counting aborted scan duration toward catch-up refresh pacing, which
was stretching the next refresh interval by the full length of a cancelled
(often slow) scan.
* Add cancellable, generation-aware git status polling to cut stale scans
- Route git.status through an abortable subscription per requestToken so
cancelStatus can actually abort the remote scan instead of being a
no-op, preventing wasted work and stale responses overwriting fresher
state.
- Bump the git status polling generation on push-target changes so an
in-flight refresh against the old remote/branch can't apply stale
upstream data to the new one.
- Guard the stale-conflict poller against writes after unmount.
- Retire pre-purge line-stat scans in the cache so an older in-flight
scan can't repopulate a key after a token-scoped purge.
