package clock

// DefaultWarningThresholds returns the default warning thresholds (60s, 30s, 10s).
// This is re-exported here for convenience; the canonical implementation
// is DefaultWarnings() in engine.go.
//
// Warning system behavior:
//   - Warnings fire when remainingNs crosses below a threshold
//   - Each threshold fires at most once per level (tracked in emittedWarnings map)
//   - On level change, emittedWarnings is reset
//   - Warning events are broadcast via WebSocket with type "clock.warning"
//
// The warning checking logic is implemented in ClockEngine.checkWarningsLocked()
// in engine.go, called on every tick.