EXPBG Ambient Civilians

- Idle watchdog: a resident with no order for IdleForceSeconds (new setting, default 75 s, 30-120) has its cooldowns cleared and a routine start or a wander leg forced; the recovery nudge now actually clears the routine cooldown; integrated QA judges the 90 s idle gates over every phase and adds a hard 120 s gate in any phase. - Routines: a routine that produced supply pays RoutineGap only (the 120-180 s rest after a failed stop is gone); the wander no longer refuses on a straight body sweep or on navmesh-projected positions that sit above the terrain heightmap (roads, kerbs, porches, doorsteps); scene spots keep a 20 s anti-repeat stamp; a routine start stops the walker's own leg instead of livelocking with it; a stop whose pose never starts is re-issued once then abandoned; a hard drain deadline; deterministic dwell lengths. - Danger: the routine gate uses the combat threat measure (a passing car no longer freezes a village); shelter probes are budgeted per tick instead of one per half second for the whole town; stand-up debt window 60 s. - Scheduler: one cheap 2 Hz tick; walk and routine maintenance in a 1 Hz batch of up to eight residents with at most one routine start per second; monitors at 2 Hz only within 200 m of a player; anchor sweeps and shelter probes on shared per-tick trace budgets; exclusion-zone tests return early on an empty list; no per-tick allocations in the hot paths; every static reset per world; spawn, despawn, cache-wake and traffic creation paced to one per tick and measured; a per-step millisecond histogram printed as `[EAC QA SCHED]`. - Traffic: cached-party wake screens the boarding navmesh at the wake spot; the horn read caches its components. - Robustness: animation root entities are never deleted while vanilla's animate behaviour may still hold them (the run-118 NodeError); the move-failure guard reports if it never fires; the voice-refused RPC only accepts residents this mod owns; an unlisted voice bug that silenced a new world fixed. - Compatibility: `[EAC settings] attributes=N/49`, `[EAC catalog] modules=N/5` and `[EAC faction] CIV resolved ai_limit=N` at the first scheduler tick name a replaced attribute list, catalog or faction; `tools/Test-ModCompat.ps1` and `tests/Start-CompatQa.ps1` audit and run the installed workshop mods (docs/MOD-COMPATIBILITY.md). - Defaults: ActivityLimit default 24 (Village 24, Town 48, City to its population), clamp raised. - Measured on build local-20260917-192401-789: ten fixtures green (443 checks); release gate RELEASABLE over 3 two-client uncapped campaigns plus an observation-only run (zero hard failures, zero exceptions, longest idle span 62 s, median 237 server FPS); scheduler p50 1 ms / p95 5 ms per tick on a village, p95 11 ms with 92 active civilians in a city at median 231 FPS. Details in docs/HANDOVER.md.