Add a test-race target and run test-unit over ./pkg/...
Production races:
- logger: guard Logger/errorTracker with an RWMutex
- security: copy UserContext for the async session-activity goroutine
and track it with a WaitGroup
Test fixes:
- eventbroker, websocketspec: use atomics for state shared with workers
- security: wait for async activity updates before touching sqlmock
- mqttspec: build full HookContext, set SubscriptionID, pin the
in-memory SQLite to one connection
Update the cross-cutting audit (X1) with status and findings.
Hein