Merge remote-tracking branch 'origin/master' into worktree/semantic-session-checkpoints

# Conflicts:
#	docs/architecture.md
#	docs/event-producer-consumer.md
#	examples/acp-agent/tests/snapshots/cancel-tool-calls/session.jsonl
#	packages/core/agent-loop/README.md
#	packages/core/agent-loop/src/loop.ts
#	packages/core/agent-loop/tests/cancel.spec.ts

packages/examples/cli-demo/tests/built-bin.e2e.ts

@@ -180,7 +180,7 @@ describe.skipIf(!existsSync(cliBin))('dsh-cli-demo BUILT bin', () => {
       )
       expect(result, JSON.stringify(result)).toMatchObject({ code, signal: null })
       expect(result.stdout).toContain('"kind":"aborted"')
-      expect(result.stderr).toContain(`received ${signal}`)
+      expect(result.stderr).toContain('turn 1 was aborted')
     }, 30_000)
   })
 })