Deferred audit retrofits from Plan #5 self-review:
- WebhookNotifier now records a job.enqueue audit row after each
successful repo.Enqueue (best-effort: failures are warn-logged, not
propagated). Added optional audit.Recorder + *slog.Logger params to
NewWebhookNotifier.
- WorktreePrune.executionPhase now records a worktree.pruned audit row
after each successful FinishPruneSuccess. Added optional audit.Recorder
param to NewWorktreePrune.
- app.go wires the existing auditRec into both constructors.
- integration_test.go: drop the _ = auditRec suppression and pass
auditRec into the webhook notifier so the closed-loop test exercises
the audit emit path.
q792602257