卫戍协议：盟约 web remake — initial import

Online co-op browser remake of Arknights' Stronghold Protocol: Alliance
(client-simulated combat, official waves/bonds/items/strategies, 3D board,
facing wheel, operator loadout, official emotes, deployment scripts).

server/sim/content/garrisons.js

@@ -0,0 +1,8 @@
+// server/sim/content/garrisons.js — 特质 (garrisons), battle side and prep side (docs/DATA.md §4, docs/META.md §2.3).
+//
+//   install(battle)             IN_BATTLE garrisons — garrisons/battle.js
+//   registerMeta(registry)      SERVER_* garrisons — garrisons/meta.js (garrison:<effectKey>)
+//   triggerGainEffects(ctx, p)  re-run the 获得时 garrisons of an owned chess piece (×投资人); returns the effects run
+
+export { install } from './garrisons/battle.js';
+export { registerMeta, triggerGainEffects } from './garrisons/meta.js';