fix(subagent): identify lifecycle runs explicitly

packages/workflow/workflow-workerthread/tests/workflow-workerthread.spec.ts

@@ -105,6 +105,7 @@ class StubProvider implements SubagentProvider {
     if (request.signal.aborted) throw new Error('child start aborted before publication')
     return {
       id: SessionId(`stub-child-${index}`),
+      localAgent: undefined,
       result: terminal.promise,
       dispose: () => {
         controlled.disposeCalls += 1
@@ -362,6 +363,7 @@ describe('dsh-workflow-workerthread', () => {
         inheritsParentContext: false,
         start: async () => ({
           id: SessionId('reject-child'),
+          localAgent: undefined,
           result: Promise.reject(new Error('backend exploded')),
           dispose: () => Promise.resolve(),
         }),
@@ -396,6 +398,7 @@ describe('dsh-workflow-workerthread', () => {
       } as unknown as SubagentResult
       const start = vi.spyOn(ctx.subagents, 'start').mockResolvedValue({
         id: SessionId('raw-invalid-child'),
+        localAgent: undefined,
         result: Promise.resolve(invalid),
         dispose: () => Promise.resolve(),
       })
@@ -419,6 +422,7 @@ describe('dsh-workflow-workerthread', () => {
         inheritsParentContext: false,
         start: async () => ({
           id: SessionId('bad-dispose-child'),
+          localAgent: undefined,
           result: Promise.resolve({ output: [{ type: 'text', text: 'fine' }], stopReason: 'completed' }),
           cancel: () => { /* settled already */ },
           dispose: () => { throw new Error('dispose exploded') },
@@ -440,6 +444,7 @@ describe('dsh-workflow-workerthread', () => {
         inheritsParentContext: false,
         start: async () => ({
           id: SessionId('trap-child'),
+          localAgent: undefined,
           result: Promise.resolve({ output: [{ type: 'text', text: 'fine' }], stopReason: 'completed' }),
           cancel: () => { /* settled already */ },
           // The rejection VALUE's own coercion throws: a warn built with bare
@@ -767,6 +772,7 @@ describe('dsh-workflow-workerthread', () => {
           }, { once: true })
           return {
             id: SessionId('signal-only-child'),
+            localAgent: undefined,
             result,
             dispose: () => Promise.resolve(),
           }
@@ -1088,6 +1094,7 @@ describe('dsh-workflow-workerthread', () => {
 
       ready.resolve({
         id: SessionId('late-ready-child'),
+        localAgent: undefined,
         result: Promise.resolve({ output: [], stopReason: 'aborted' }),
         dispose: () => {
           disposeCalls += 1
@@ -1124,6 +1131,7 @@ describe('dsh-workflow-workerthread', () => {
           }, { once: true })
           return {
             id: SessionId('doomed-child'),
+            localAgent: undefined,
             result: new Promise(() => { /* never settles; the reap is the teardown */ }),
             dispose: () => Promise.reject(new Error('dispose exploded during reap')),
           }