feedback4: merge master — PR #73 (operator battle voices); golden regenerated: every moved roster / bonds / fields scenario differs only in events.engage (the sim's new 'engage' event for the voice slot; no gameplay change), matches unchanged

shared/protocol.js

@@ -341,7 +341,7 @@ export function validateC2S(msg) {
 
 // Event tuple kinds inside `b.ev` (DESIGN §8.2).
 export const EV = Object.freeze({
-  SPAWN: 'spawn', ATK: 'atk', DMG: 'dmg', HEAL: 'heal', SKILL: 'skill', DIE: 'die', LEAK: 'leak',
+  SPAWN: 'spawn', ATK: 'atk', DMG: 'dmg', HEAL: 'heal', SKILL: 'skill', ENGAGE: 'engage', DIE: 'die', LEAK: 'leak',
   STATUS: 'status', FX: 'fx', LAYER: 'layer', BOUNTY: 'bounty', DEPLOY: 'deploy',
 });