EXPBG Ambient Units

Full test round 2026-10-14/15 (owner request: "full testing ... unit cache with animations applied"). Requires EXPBG Gamemaster Tools 0.3.3 (new pose hook `IsPoseSettled`). - **Animations in a Unit Caching zone cache within seconds.** A squad with a repeated gesture or a playlist was cached only at an instant when every animation played; between two gesture repeats or two playlist steps the attempt was refused (full modset on Watchtower: 90 s with a gesture). The pose control now tells Gamemaster Tools 0.3.3 that it may pause between two plays when nothing is half started (no entry queued, no Bon item on its way to the hand, no loiter exit or gesture running); the wake starts the animation again as before. - **A playlist step does not run down while he is paused.** Time cached by Unit Caching or paused for distance (no player or Game Master camera within 500 m) no longer counts against the step's own length, so a woken soldier goes on with the animation he was playing instead of switching at once and standing for the switch (it took 13 s from Bon to Smoke). - Tests: new native fixture `tests/EAN_CacheGameplay.c` (114 checks): a Bon item, a vanilla loiter, a playlist, a repeated gesture and Freeze in a Full cache zone; two sleep and wake cycles, the stand-in player near and gone, a Game Master changing and releasing soldiers while they are cached; same actors on their spots, same codes and payloads, everyone animating again, the playlist advancing, heading held, no loose or leaked Bon item. `EAN_AnimationGameplay.c` waits for the hand to be empty after a distance pause (timing). Full round: every Ambient Units fixture, every Gamemaster Tools fixture with this pack loaded, the CDF round trips and a full-modset game session (see `tests/GAMEPLAY.md`).