Static mirroring worker (417 lines) has no unit tests #904

Gap

src/app/static-mirroring-worker.ts (417 lines) — the worker that mirrors relay events to configured upstream relays — has no unit tests. No spec file in the suite references it, directly or otherwise.

This is a core data path: connection lifecycle, subscription management, event relaying, reconnection. The relay-monitor worker does have a spec (test/unit/app/relay-monitor-worker.spec.ts), so again the gap is specific, not systemic.

How measured

Import graph over the suite: 175 spec files vs 325 src/**/*.ts files — zero references to this module.

What's worth covering

• Reconnect behavior: backoff, reconnectCount accounting, connectionState transitions (connecting/open/closed)
• The ops heartbeat publishing added recently — lastError/lastEventAt/reconnectCount correctness (the relay-monitor's keepalive had a state-clobbering bug of exactly this shape; this worker's keepalive republishes full state, but nothing pins that)
• Subscription lifecycle: what happens on config change / shutdown (the interval cleanup)