Follow-up to the audit-log backend + surface. Emits a DashboardEvent on
each agent-initiated privileged action so the audit view live-appends off
/dashboard/stream instead of polling.
- new DashboardEvent::AuditEntryAdded { seq, <flattened AuditEntry> } —
serde tag `audit_entry_added`; the AuditEntry fields flatten to the top
level so the wire shape matches one /api/audit-log `entries` row exactly.
- Coordinator::emit_audit_entry helper (stamps seq like the others).
- audit_log::record now returns the canonical inserted AuditEntry (id + ts
assigned) so the streamed event is the same row that was stored — no
drift. Best-effort unchanged (None on a sqlite blip).
- handle_restart_infra records + emits for every attempt (ok/err/denied),
threading the coordinator through.
Tests: kind_tag round-trip now covers the new variant; added a flatten
test pinning the top-level wire shape (kind/seq/id/…/detail, no nesting).
Pairs with iris's audit view (the /dashboard/stream listener half).
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