A team launch creates many directories/files in quick succession (worktrees,
inboxes, session logs), and each addDir/unlinkDir event triggered a full
TeamTaskWatchRegistry reconcile that tore down and recreated the entire chokidar
watcher (re-opening a kqueue fd per watched file on macOS). Profiling a 6-member
mixed-team launch showed kqueue churn (kevent) as a top native cost and watcher
rebuild as the top remaining main-thread JS cost after the transcript fix.
Debounce the event-driven reconcile (250ms) so a burst collapses into one rebuild.
collectTargets re-reads the current directory state and emitExistingFilesForNewTargets
backfills files created before the rebuild, so no change is missed; requestReconcile,
startup, and the periodic 30s reconcile stay immediate. Adds a test asserting a
burst of addDir events yields a single rebuild.
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