fix(subagent): confirm steering request admission

packages/context/time-context/tests/time-context.spec.ts

@@ -44,7 +44,7 @@ function sessionAgent(session: Session, id = 'agent'): Agent {
     acceptsNextStep: true,
     ctx: new Context(),
     followup: () => {},
-    steer: () => {},
+    steer: () => ({ outcome: Promise.resolve({ status: 'rejected' as const }) }),
     inject(input) {
       session.append('user/message', input, { surfaceOp: 'append' })
     },

packages/context/tmux-context/tests/tmux-context.spec.ts

@@ -100,7 +100,7 @@ function sessionAgent(session: Session, id = 'agent'): Agent {
     acceptsNextStep: true,
     ctx: new Context(),
     followup: () => {},
-    steer: () => {},
+    steer: () => ({ outcome: Promise.resolve({ status: 'rejected' as const }) }),
     updateInbox: () => 'not-found',
     inject(input) {
       session.append('user/message', input, { surfaceOp: 'append' })

packages/context/workspace-context/tests/workspace-context.spec.ts

@@ -179,7 +179,7 @@ function stubAgent(cwd?: string, seed: SessionEvent[] = []): Agent {
     status: 'idle',
     acceptsNextStep: false,
     followup: () => {},
-    steer: () => {},
+    steer: () => ({ outcome: Promise.resolve({ status: 'rejected' as const }) }),
     inject(input) {
       session.append('user/message', input, { surfaceOp: 'append' })
     },