fix(coord): add neutral interaction route alias

apps/gateway/src/coord/interaction-coordination.controller.ts

@@ -22,7 +22,8 @@ import type {
 import { InteractionCoordinationService } from './interaction-coordination.service.js';
 
 /** Authenticated interaction-plane boundary for the handoff/observe/result-only interaction coordination contract. */
-@Controller('api/coord/mos')
+/** `api/coord/interaction` is canonical; the Mos path remains a compatibility alias. */
+@Controller(['api/coord/interaction', 'api/coord/mos'])
 @UseGuards(AuthGuard)
 export class InteractionCoordinationController {
   constructor(