- Fix doctests for Accounts, Agents.Stats, Snmp to match actual behavior
- Fix dynamic_extra_test vendor post-processing tests to seed sensor data
- Fix activity_controller_test to seed devices for feed data
- Fix session_manager_test to create browser session for test
- Fix topology_test link creation for connection test
- Fix device_monitor/driver_worker tests for unique job constraints
- Fix accounts_test expired_tokens assertion (magic link token is expired)
- Fix happy_path_test and show_events_test to seed monitor data
- Fix admin user_live_test user.name -> user.email (no name field)
- Fix schema_test to seed activity data
- Fix mobile_qr_live_test to match actual template text
- Fix SnmpKit.MIB doctests and tests for enriched return values
- Fix onboarding_live, mobile_controller, mib_test weak assertions
- Remove dead code and fix credo warnings
- Remove all 25ms and 50ms sleeps from agent_channel_test
- Add poll_until helper for async DB operations (early exit on success)
- Reduce timeout test sleeps from 100ms to 60ms
- Reduce polling delays from 10ms to 5ms in multiple tests
- Remove unnecessary timestamp and background task sleeps
- Reduce circuit breaker recovery sleep from 150ms to 110ms
Performance: 30.3s → 28.3s (6.6% faster)
Total improvement from baseline: 52s → 28.3s (45.6% faster)
