refactor(agent-loop): simplify observable state machine

packages/examples/cli-demo/tests/cli.spec.ts

@@ -319,7 +319,7 @@ describe('runOneShot and executeCli', () => {
     const { ctx, agent, persistenceRoot } = await harness([textResponse('final answer')])
     const output = await invoke(ctx, ['task'])
     expect(output).toEqual({ code: 0, stdout: 'final answer\n', stderr: '' })
-    expect(agent.status).toBe('disposed')
+    expect(agent.status).toBe('idle')
     const files = await readdir(persistenceRoot, { recursive: true })
     expect(files.some(file => file.endsWith('.jsonl.zstd'))).toBe(true)
   })
@@ -379,11 +379,13 @@ describe('runOneShot and executeCli', () => {
     const output = await invoke(ctx, ['--output-format', 'stream-json', 'task'])
     const lines = output.stdout.trimEnd().split('\n').map(line => JSON.parse(line) as Record<string, unknown>)
     const events = lines.slice(0, -1).map(line => line['event'] as SessionEvent)
-    expect(lines.at(-1)).toMatchObject({ type: 'result', success: true, turn: 2, result: 'streamed' })
-    expect(events[0]).toMatchObject({ type: 'turn/start', data: { turn: 2, trigger: { kind: 'message' } } })
-    expect(events.at(-1)).toMatchObject({ type: 'turn/end', data: { turn: 2 } })
+    expect(lines.at(-1)).toMatchObject({ type: 'result', success: true, turn: 1, result: 'streamed' })
+    expect(events[0]).toMatchObject({ type: 'turn/start', data: { turn: 1, trigger: { kind: 'message' } } })
+    expect(events.at(-1)).toMatchObject({ type: 'turn/end', data: { turn: 1 } })
     expect(lines.slice(0, -1).every(line => line['sessionId'] === agent.session.id)).toBe(true)
-    expect(events.some(event => event.type === 'user/message' && event.data.source.kind !== 'user')).toBe(false)
+    expect(events.some(event => event.type === 'user/message'
+      && event.data.source.kind === 'plugin'
+      && event.data.source.plugin === 'test')).toBe(false)
   })
 
   it('emits partial data and a diagnostic for non-completed turns', async () => {
@@ -409,7 +411,7 @@ describe('runOneShot and executeCli', () => {
     expect(JSON.parse(output.stdout)).toMatchObject({ success: false, reason: { kind: 'aborted' } })
     expect(output.code).toBe(1)
     expect(output.stderr).toContain('turn 1 was aborted')
-    expect(agent.status).toBe('disposed')
+    expect(agent.status).toBe('idle')
   })
 
   it('contains stream-writer failures, cancels, flushes, and returns the output error', async () => {
@@ -444,7 +446,7 @@ describe('runOneShot and executeCli', () => {
     expect(output.code).toBe(1)
     expect(output.stdout).toBe('')
     expect(output.stderr).toContain('stdout closed')
-    expect(final.agent.status).toBe('disposed')
+    expect(final.agent.status).toBe('idle')
 
     const disposal = await harness([textResponse('answer')])
     const disposalOutput = await invoke(disposal.ctx, ['task'], { failDispose: true })