hermes -w locks each worktree (reason 'hermes pid=<pid>'). git worktree
remove --force (single -f) refuses a locked tree, so a crashed session's
lock was never released and its worktree accumulated forever — a real
contributor to .worktrees/ bloat.
_prune_stale_worktrees now classifies each lock via _worktree_lock_is_live:
a live-owner pid is skipped at any age; a dead-owner (or foreign) lock is
unlocked first so the aggressive age-based cleanup can actually reap it.
The >72h reap tier is kept (that cleanup is intentional) but now guarded so
dirty/unpushed work is preserved, and branch deletion is gated on
git worktree remove succeeding. New fail-safe helpers _worktree_is_dirty
and _worktree_lock_is_live (pid liveness via gateway.status._pid_exists,
Windows-safe).
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