Feature flags
Categories per §29: release / experiment / permission / kill_switch.
| Category | Key | Default | Active | Description |
|---|---|---|---|---|
| heartbeat | enabled | true | yes | Per-Person heartbeat enable flag (Layer 3 kill-switch per §8.7.7). |
| heartbeat | tick_interval_ms | 300000 | yes | Default per-Person heartbeat tick interval (milliseconds). M5.1 default: 5 minutes. |