- ClockEngine with full state machine (stopped/running/paused transitions)
- Level management: load, advance, rewind, jump, hand-for-hand mode
- Drift-free ticker at 100ms with 1/sec broadcast (10/sec in final 10s)
- ClockRegistry for multi-tournament support (thread-safe)
- ClockSnapshot for reconnecting clients (CLOCK-09)
- Configurable overtime mode (repeat/stop)
- Crash recovery via RestoreState (resumes as paused for safety)
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
