Merge remote-tracking branch 'origin/master' into xtr/react-loop-simplification

# Conflicts:
#	.agents/notes/implemented/architecture/2026-07-19-package-owned-invariant-service.i18n.yaml
#	examples/acp-agent/tests/snapshots/fs-glob-sampling/session.jsonl
#	packages/ui/tui/README.i18n.yaml
#	packages/ui/tui/src/components/dialogs.ts
#	packages/ui/tui/tests/tui.spec.ts

packages/ui/tui/tests/harness.ts

@@ -67,6 +67,8 @@ export interface TuiHarnessOptions {
   sessionPersistence?: {
     list(): Promise<SessionHeader[]>
     load?(id: ReturnType<typeof SessionId>): Promise<{ meta: SessionHeader; events: Session['events'] }>
+    /** Per-session artifact location for mtime-based activity; defaults to none. */
+    locate?(meta: SessionHeader): { kind: string; path: string } | undefined
   }
   handoffResume?: TuiRuntime['handoffResume']
   /** Host-supplied exit line; absent exercises the no-message path. */
@@ -154,7 +156,7 @@ export async function createTuiTestHarness<TerminalType extends Terminal, Exit e
     const persistence = options.sessionPersistence
     ctx.provide('sessionPersistence', {
       ...persistence,
-      locate: () => undefined,
+      locate: (meta: SessionHeader) => persistence.locate?.(meta),
       create: () => Promise.resolve(),
       append: () => Promise.resolve(),
       load: persistence.load === undefined