feat: add structured room role metadata

runners/codex-runner/src/index.ts

@@ -19,6 +19,10 @@ import {
   CodexAppServerClient,
   type AppServerInputItem,
 } from './app-server-client.js';
+import {
+  prependRoomRoleHeader,
+  type RoomRoleContext,
+} from './room-role-context.js';
 
 // ── Types ──────────────────────────────────────────────────────────
 
@@ -31,6 +35,7 @@ interface ContainerInput {
   isScheduledTask?: boolean;
   assistantName?: string;
   agentType?: string;
+  roomRoleContext?: RoomRoleContext;
 }
 
 interface ContainerOutput {
@@ -464,6 +469,7 @@ async function main(): Promise<void> {
   if (pending.length > 0) {
     prompt += '\n' + pending.join('\n');
   }
+  prompt = prependRoomRoleHeader(prompt, containerInput.roomRoleContext);
 
   try {
     log('Runtime selected: app-server');

runners/codex-runner/src/room-role-context.ts

@@ -0,0 +1,23 @@
+export interface RoomRoleContext {
+  serviceId: string;
+  role: 'owner' | 'reviewer';
+  ownerServiceId: string;
+  reviewerServiceId: string;
+  failoverOwner: boolean;
+}
+
+export function prependRoomRoleHeader(
+  prompt: string,
+  roomRoleContext?: RoomRoleContext,
+): string {
+  if (!roomRoleContext) {
+    return prompt;
+  }
+
+  const header =
+    `[ROOM_ROLE self=${roomRoleContext.serviceId} role=${roomRoleContext.role} ` +
+    `owner=${roomRoleContext.ownerServiceId} reviewer=${roomRoleContext.reviewerServiceId} ` +
+    `failover=${roomRoleContext.failoverOwner ? 1 : 0}]`;
+
+  return `${header}\n\n${prompt}`;
+}