Adds a durable, operator-visible audit trail of privileged operations
hive-c0re performs on behalf of an agent — the ones that cross the
agent/operator trust boundary. First entry: infra-container restarts via
the infra_admin-gated `restart` tool, which until now were recorded only
as a hive-priv journal trace.
Backend:
- new `audit_log` module: sqlite-backed store (audit_log.sqlite, same dir
as build_logs) with schema (ts/agent/action/target/outcome/detail),
best-effort `record`, `list_recent` (clamped 500), 90-day `vacuum`, and
a process-singleton handle mirroring build_logs.
- Coordinator opens + installs the handle; main spawns the hourly vacuum.
- agent_server::handle_restart_infra records every attempt (ok, error, and
capability-denied) via the global handle — best-effort, never fails the
underlying action.
- dashboard: `GET /api/audit-log` returns recent entries as JSON.
Scope is deliberately agent-initiated privileged actions only (not every
PrivRequest — token writes + nspawn edits are constant lifecycle noise).
Extensible: future agent-initiated priv ops record via the same handle.
Unit tests cover record/list ordering, the 500 clamp, and retention vacuum.
The dashboard *surface* (an AUDIT view consuming /api/audit-log) is a
frontend follow-up coordinated with iris.
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