refactor(agent): simplify inbox-driven turn admission

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

@@ -38,13 +38,10 @@ function stubAgentForSession(session: Session): StubAgent {
     inbox,
     ctx: new Context(),
     status: 'idle',
-    acceptsNextStep: false,
     send: () => {},
-    updateInbox: () => 'not-found',
     followup: () => {},
     steer: () => {},
     inject(input) { inbox.append('next-step', input) },
-    reserveTurnAdmission: () => undefined,
     cancel() {},
     whenIdle() { return Promise.resolve() },
   }
@@ -76,7 +73,7 @@ function appendRound(session: Session, ref: GoalRef, round: number): void {
   session.append('user/message', createUserMessage({
     content: [{ type: 'text', text: `round ${round}` }], source,
   }), { surfaceOp: 'append' })
-  session.append('turn/end', { turn, reason: { kind: 'completed' } })
+  session.append('turn/end', { turn, step: 0, reason: { kind: 'completed' } })
 }
 
 describe('GoalService creation and replay', () => {
@@ -584,7 +581,7 @@ describe('goal replay validation', () => {
     session.append('user/message', createUserMessage({
       content: [{ type: 'text', text: 'ordinary' }], source,
     }), { surfaceOp: 'append' })
-    session.append('turn/end', { turn, reason: { kind: 'completed' } })
+    session.append('turn/end', { turn, step: 0, reason: { kind: 'completed' } })
     expect(foldGoal(session.events)).toEqual({ roundsStarted: 0 })
   })
 
@@ -726,7 +723,7 @@ describe('goal replay validation', () => {
     session.append('user/message', createUserMessage({
       content: [{ type: 'text', text: 'missing' }], source,
     }), { surfaceOp: 'append' })
-    session.append('turn/end', { turn, reason: { kind: 'completed' } })
+    session.append('turn/end', { turn, step: 0, reason: { kind: 'completed' } })
     expect(() => foldGoal(session.events)).toThrow('goal message source is invalid')
   })
 

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

@@ -45,7 +45,6 @@ function liveAgent(ctx: Context, session: Session): Agent {
     inject(input: UserMessage) {
       inbox.append('next-step', input)
     },
-    reserveTurnAdmission: () => undefined,
     cancel() {},
     whenIdle() { return Promise.resolve() },
   }