refactor(agent): simplify inbox-driven turn admission

packages/goal/command-goal/tests/command-goal.spec.ts

@@ -29,13 +29,10 @@ function stubAgent(ctx: Context, id: string): { agent: Agent; session: Session }
     inbox,
     ctx: new Context(),
     get status() { return status },
-    get acceptsNextStep() { return status === 'running' },
     send: () => {},
-    updateInbox: () => 'not-found',
     followup: () => {},
     steer: () => {},
     inject(input) { inbox.append('next-step', input) },
-    reserveTurnAdmission: () => undefined,
     cancel() { status = 'idle' },
     whenIdle() { return Promise.resolve() },
   }

packages/goal/goal-session/tests/goal-session.spec.ts

@@ -994,7 +994,7 @@ describe('same-session goal driving', () => {
     orphan.append('turn/start', {
       turn: 1,
     })
-    orphan.append('turn/end', { turn: 1, reason: { kind: 'completed' } })
+    orphan.append('turn/end', { turn: 1, step: 0, reason: { kind: 'completed' } })
 
     const handle = await test.ctx.agents.create({
       sessionId: SessionId('goal-session-disposed'),

packages/goal/goal-session/tests/invariant.spec.ts

@@ -41,7 +41,7 @@ function appendRound(session: Session, turn: number, content = renderGoalRoundPr
   session.append('user/message', createUserMessage({
     content, source,
   }), { surfaceOp: 'append' })
-  session.append('turn/end', { turn, reason: { kind: 'completed' } })
+  session.append('turn/end', { turn, step: 0, reason: { kind: 'completed' } })
 }
 
 async function mount(sessionFirst = false): Promise<{ ctx: Context; session: Session }> {
@@ -73,7 +73,7 @@ describe('goal-session prompt invariants', () => {
       content: [{ type: 'text', text: 'ordinary human message' }],
       source: userSource,
     }), { surfaceOp: 'append' })
-    session.append('turn/end', { turn: 4, reason: { kind: 'completed' } })
+    session.append('turn/end', { turn: 4, step: 0, reason: { kind: 'completed' } })
 
     const stateSource = {
       kind: 'goal', goalId: change.goal.id, revision: change.goal.revision, round: 0,

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() },
   }

packages/goal/tool-goal/tests/tool-goal.spec.ts

@@ -38,7 +38,6 @@ function stubAgent(rawId: string, supplied?: Session): StubAgent {
     inject(input) {
       this.inbox.append('next-step', input)
     },
-    reserveTurnAdmission: () => undefined,
     cancel() {},
     whenIdle() { return Promise.resolve() },
   }
@@ -66,7 +65,7 @@ function openTurn(stub: StubAgent, source: MessageSource, text = 'prompt'): numb
 
 /** Close the currently open test turn. */
 function closeTurn(stub: StubAgent, turn: number): void {
-  stub.session.append('turn/end', { turn, reason: { kind: 'completed' } })
+  stub.session.append('turn/end', { turn, step: 0, reason: { kind: 'completed' } })
 }
 
 async function harness(config: toolGoal.Config = {}) {