docs(bd-29t): note that ActivityStream E2E test already exists

The E2E test at src/web/frontend/components/ActivityStream.e2e.test.tsx
already comprehensively covers all requirements: chronological order,
timestamp formatting, level colors, scrolling behavior, and filtering.

All 20 tests pass successfully.

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

notes/bd-29t.md

@@ -0,0 +1,51 @@
+# BD-29T: ActivityStream E2E Test
+
+## Task
+Create a vitest test that verifies ActivityStream component displays log entries in chronological order with proper timestamps, level colors, scrolling behavior, and filtering.
+
+## Status
+**Already Complete** - The E2E test already exists at `src/web/frontend/components/ActivityStream.e2e.test.tsx` and comprehensively covers all requirements.
+
+## Test Coverage
+The existing test includes 20 test cases across 6 categories:
+
+### 1. Chronological Order (3 tests)
+- Renders events in the order provided
+- Handles 100+ events in correct order
+- Preserves order across mixed log levels
+
+### 2. Timestamp Formatting (2 tests)
+- Formats timestamps as HH:MM:SS (24-hour)
+- Displays distinct timestamps for distinct events
+
+### 3. Level Colors (3 tests)
+- Applies correct CSS class for each log level (debug, info, warn, error)
+- Displays level text matching the level value
+- Colors mixed event streams correctly
+
+### 4. Scrolling Behavior (4 tests)
+- Auto-scrolls to bottom when events change
+- Handles multiple events arriving at once
+- Scrolls to timeline-highlighted event
+- Removes timeline-highlight after 3 seconds
+
+### 5. Filtering (4 tests)
+- Shows filter controls when enabled
+- Shows "No events match" message when filter excludes all
+- Displays filtered event count in header
+- Distinguishes empty vs filtered-empty states
+
+### 6. Complete Display Workflow (4 tests)
+- Renders realistic multi-worker event stream
+- Hides worker names when specific worker selected
+- Auto-scrolls on each event update
+- Handles bead pinning display
+
+## Test Results
+All 20 tests pass:
+```
+✓ src/web/frontend/components/ActivityStream.e2e.test.tsx (20 tests) 183ms
+```
+
+## Conclusion
+No code changes were required. The existing E2E test suite fully satisfies the task requirements.