Verified implementation and fixed docstring references: 1. **Verified**: All 8 E2E tests in `tests/e2e/test_comment_add_milkdown.py` pass when run against the local server 2. **Fixed**: Updated all docstring references from TRCKR-651 (non-existent) to TRCKR-411 (this issue) Test coverage: - Simple text comment via Milkdown editor - Markdown formatted comments (headings, bold) - Anonymous comments (no author) - Multiple comments on same issue - Comment count updates in UI - Editor clears after submit - Special characters in comments - Milkdown editor visibility and initialization All tests verified passing: `E2E_BASE_URL=http://localhost:3102 uv run pytest tests/e2e/test_comment_add_milkdown.py -v`

Implementation Complete - Created comprehensive E2E test suite in tests/e2e/test_comment_add_milkdown.py with 8 tests for adding comments to issues via the Milkdown rich text editor. All 8 tests pass. Tests cover: simple text comments, markdown formatting, anonymous comments, multiple comments, comment count updates, editor clearing, special characters, and editor visibility verification.