Merge main into offline-write-queue: resolve index.ts, fix stale standup assertion

- index.ts: keep both cache (#3) and queue (#33) exports
- agent.test.ts: #28 landed the standup impl but left agent.test.ts asserting
  standup is notImplemented (its real test moved to query-project.test.ts);
  retarget the unbuilt-view assertion to milestone/runway, which are still stubs

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

packages/core/src/agent/agent.test.ts

@@ -276,6 +276,7 @@ describe('buildProjectView', () => {
   })
 
   it('unbuilt views return a notImplemented marker, not fabricated data', () => {
-    expect(buildProjectView('standup', undefined, snap, asOf)).toEqual({ notImplemented: 'standup' })
+    expect(buildProjectView('milestone', undefined, snap, asOf)).toEqual({ notImplemented: 'milestone' })
+    expect(buildProjectView('runway', undefined, snap, asOf)).toEqual({ notImplemented: 'runway' })
   })
 })