docs: replace vague provenance prose with recorded facts

packages/subagent/tool-subagent-report/README.i18n.yaml

@@ -2,5 +2,5 @@
 # side as of the last confirmed-consistent state. Both languages carry equal authority;
 # after editing either side, bring the other along and re-record with:
 #   pnpm run verify-translation-pairing --write packages/subagent/tool-subagent-report/README.md
-README.md: cd73154dfb9c8b37f4a811c3beedbe6a63207f58
-README.zh.md: 501598ec4e731b9315f3f08e0c81f5bb655c2b34
+README.md: 1772b72d83563e89ed0e3814e515b06a2b36fe0f
+README.zh.md: 94101fbc9611a04c56ed3a9171889499c9144c21

packages/subagent/tool-subagent-report/README.md

@@ -46,7 +46,7 @@ Append-only in the child. In the parent, the framed report follows existing hist
 
 #### What the model sees
 
-One user-role parent message framed as `Background subagent <child-id> reported:` followed by the child's exact `output`, with durable provenance `{ kind: 'subagent-report', senderSessionId: <child-id> }`.
+One user-role parent message framed as `Background subagent <child-id> reported:` followed by the child's exact `output`, with a durable source `{ kind: 'subagent-report', senderSessionId: <child-id> }` that names the child.
 
 #### Token effect
 

packages/subagent/tool-subagent-report/README.zh.md

@@ -46,7 +46,7 @@
 
 #### 模型看到的内容
 
-一条用户角色的父级消息，以 `Background subagent <child-id> reported:` 开头，后接子级未经改动的 `output`，并带有持久化来源 `{ kind: 'subagent-report', senderSessionId: <child-id> }`。
+一条用户角色的父级消息，以 `Background subagent <child-id> reported:` 开头，后接子级未经改动的 `output`，并带有指明该子级的持久化来源 `{ kind: 'subagent-report', senderSessionId: <child-id> }`。
 
 #### Token 影响
 

packages/subagent/tool-subagent-report/tests/tool-subagent-report.spec.ts

@@ -159,7 +159,7 @@ describe('dsh-tool-subagent-report', () => {
     expect(names).not.toContain('send_message')
   })
 
-  it('delivers quiet reports with stable identity and provenance without waking', async () => {
+  it('delivers quiet reports with stable message and sender identities without waking', async () => {
     const { ctx, parent, adapter } = await setup()
     const { started, child } = await startChild(ctx, parent)
     const parentRequests = adapter.requests.filter(request => request.sessionId === parent.id).length