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Neil
501337454c
The main-process worktree resolution cache expired on wall-clock time: the whole-fleet snapshot has a 1s TTL, so any poller faster than 1Hz recomputed it, and every 30s the per-repo scan cache expired and shelled out `git worktree list` for every registered repo. A production trace recorded 4,272 `git worktree` invocations over 3h27m across 10 repos. In-Orca mutations are already event-driven, so the 30s TTL existed only to discover changes made outside Orca. Before re-running an expired scan for a local, non-WSL repo, read a cheap subprocess-free Git-admin fingerprint (admin dir entries, per-checkout HEAD and its ref tip, gitdir/locked/existence per entry, packed-refs and reftable stamps). If it matches the fingerprint captured at the cached scan's start, extend the cache without spawning Git. A real scan still runs every 5 minutes so anything the probe cannot see still reconciles. Measured: 600 -> 60 `git worktree list` spawns on the reported workload (10 idle repos, 1Hz polling, 30 simulated minutes), and main-thread event-loop stall of 2.69ms -> 0.01ms per refresh. External worktree add/remove/move/lock/checkout/commit discovery stays bounded at 30s. SSH repos, WSL-routed repos, folder workspaces, agent-scratch repos, and any repo whose layout the probe cannot read keep today's behaviour exactly. Design: docs/reference/worktree-scan-fingerprint.md