docs(bd-1j9): note that WorkerDetail E2E tests already exist

The requested vitest E2E test for WorkerDetail already exists with
comprehensive coverage (30 tests passing for TUI, 39 for web frontend).

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

notes/bd-1j9.md

@@ -0,0 +1,54 @@
+# bd-1j9: E2E test for WorkerDetail
+
+## Finding
+
+The requested vitest E2E test for WorkerDetail **already exists** and passes all tests.
+
+## Existing Tests
+
+### TUI E2E Test: `src/tui/components/WorkerDetail.e2e.test.ts`
+- **30 tests passing**
+- File header matches the task description exactly:
+  ```
+  E2E Test: WorkerDetail Panel
+
+  Verifies that WorkerDetail panel shows correct information for a selected
+  worker including status, uptime, beads completed, and recent events.
+  ```
+- Coverage includes:
+  - No worker selected placeholder
+  - Worker status display (active/idle/error) with colors and icons
+  - Uptime formatting (seconds, minutes+seconds, hours+minutes)
+  - Beads completed count
+  - Last activity display (time, level, bead, tool, message, duration, error)
+  - Recent events display (limited to 10 shown, 20 stored)
+  - Visibility methods (show/hide/toggle/focus)
+  - Worker switching
+
+### Web Frontend Test: `src/web/frontend/test/WorkerDetail.test.tsx`
+- **39 tests passing**
+- React component testing with @testing-library/react
+- Coverage includes:
+  - Worker status display
+  - Event count display
+  - Current tool display
+  - Last seen formatting
+  - Recent events display with truncation
+  - Collision alert display
+  - CSS classes
+  - Accessibility attributes
+  - Edge cases
+
+## Test Results
+
+```bash
+$ npm test -- src/tui/components/WorkerDetail.e2e.test.ts
+✓ 30 tests passed (18ms)
+
+$ npm test -- src/web/frontend/test/WorkerDetail.test.tsx
+✓ 39 tests passed (150ms)
+```
+
+## Conclusion
+
+No new code was needed. The E2E test infrastructure for WorkerDetail is already comprehensive and functional.