Merge remote-tracking branch 'origin/master' into feat/todo-multi-in-progress

# Conflicts:
#	.agents/notes/implemented/feature/2026-06-29-todo-write-tool.i18n.yaml
#	.agents/notes/implemented/feature/2026-07-23-web-todo-display.i18n.yaml
#	docs/core-data-structures/session.i18n.yaml
#	examples/acp-agent/tests/snapshots/fs-policy-reject/session.jsonl
#	examples/acp-agent/tests/snapshots/fs-write-overwrite/session.jsonl
#	examples/acp-agent/tests/snapshots/fs-write/session.jsonl
#	examples/acp-agent/tests/snapshots/todo-write/session.jsonl
#	examples/headless-agent/tests/todo-write.e2e.ts
#	packages/client/ui-conversation/README.i18n.yaml
#	packages/client/ui-conversation/README.md
#	packages/client/ui-conversation/README.zh.md
#	packages/todo/tool-todo/README.i18n.yaml

packages/client/connection/tests/fixture.spec.ts

@@ -69,7 +69,10 @@ describe('createFixtureApi', () => {
     // tail block still rides it — empty-log cut at -1, the host convention.
     const empty = await api.sessions.history(req({ sessionId: sid('no-such'), maxMessages: 10 }))
     if (!empty.result.ok) throw new Error('empty failed')
-    expect(empty.result.value).toEqual({ events: [], hasMore: false, projections: { asOfSeq: -1, values: {} } })
+    // Fixture composes the todos unit (host parallel when tool-todo is mounted): null before any write.
+    expect(empty.result.value).toEqual({
+      events: [], hasMore: false, projections: { asOfSeq: -1, values: { todos: null } },
+    })
   })
 
   it('serves grouped models and keeps a selected target for later history and fixture requests', async () => {