fix(subagent): confirm steering request admission

packages/goal/goal/tests/goal.spec.ts

@@ -50,7 +50,7 @@ function stubAgentForSession(session: Session): StubAgent {
     send: () => {},
     updateInbox: () => 'not-found',
     followup: () => {},
-    steer: () => {},
+    steer: () => ({ outcome: Promise.resolve({ status: 'rejected' as const }) }),
     inject(input) {
       if (shouldDefer) deferred.push(input)
       else appendInjection(session, input)

packages/goal/goal/tests/projection.spec.ts

@@ -41,7 +41,7 @@ function liveAgent(ctx: Context, session: Session): Agent {
     send: () => {},
     updateInbox: () => 'not-found',
     followup: () => {},
-    steer: () => {},
+    steer: () => ({ outcome: Promise.resolve({ status: 'rejected' as const }) }),
     inject(input: UserMessage) {
       session.append('user/message', input, { surfaceOp: 'append' })
     },