test(agent-loop): update lifecycle regression contracts

packages/core/agent-loop/tests/tool-order.spec.ts

@@ -98,19 +98,17 @@ describe('loop-level canonical tool order', () => {
     const adapter = new MockAdapter([textResponse('never sent')])
     const ctx = await harness(adapter, ['ghost', TOOL_ORDER_REST])
     registerNamed(ctx, 'alpha')
-    const errors: Error[] = []
-    ctx.on('agent/error', (_agent, _turn, _step, error) => {
-      if (error instanceof Error) errors.push(error)
-    })
     const agent = ctx.agentLoop.create(SessionId('a1'), { provider: 'mock', model: 'mock' })
     agent.followup(createUserMessage({ content: [{ type: 'text', text: 'go' }], source: { kind: 'user' } }))
     await waitForIdle(ctx, agent)
     expect(adapter.requests).toHaveLength(0)
-    expect(errors.map(e => e.message)).toEqual(['toolOrder lists unregistered tool "ghost"; known tools: alpha'])
     expect(foldRequestHeader(agent.session.events)).toBeUndefined()
     const end = agent.session.events.find(e => e.type === 'turn/end')
-    expect(end?.type === 'turn/end' && end.data.reason).toMatchObject({ kind: 'error', step: 1 })
-    // The turn is balanced (turn/start → turn/end) with no step events inside.
-    expect(agent.session.events.some(e => e.type === 'step/start')).toBe(false)
+    expect(end?.type === 'turn/end' && end.data.reason).toEqual({
+      kind: 'error',
+      error: 'toolOrder lists unregistered tool "ghost"; known tools: alpha',
+    })
+    expect(agent.session.events.filter(e => e.type === 'step/start')).toHaveLength(1)
+    expect(agent.session.events.filter(e => e.type === 'step/end')).toHaveLength(1)
   })
 })