docs(bf-1373): verify parseDiff implementation - all tests pass

The parseDiff function in src/tui/components/DiffView.ts correctly:
- Returns empty array for empty input
- Splits diff on newlines
- Classifies '+++' and '---' as headers (not added/removed)
- Classifies '+' lines as added
- Classifies '-' lines as removed

All 44 DiffView tests pass. No code changes needed.

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

notes/bf-1373.md

@@ -0,0 +1,21 @@
+# BF-1373: DiffView.parseDiff Verification
+
+## Bead Description
+The bead described failing tests in `src/tui/components/DiffView.test.ts`:
+- "should parse added lines"
+- "should parse removed lines"  
+- "should handle empty diff"
+
+## Investigation
+All 44 tests in DiffView.test.ts pass. The `parseDiff` function implementation is correct:
+
+1. **Empty input**: Returns empty array (lines 62-64)
+2. **Splits on newlines**: `diffText.split('\n')` (line 65)
+3. **File headers**: `---` and `+++` classified as 'header' (lines 83-86)
+4. **Added lines**: Lines starting with `+` classified as 'added' (lines 100-107)
+5. **Removed lines**: Lines starting with `-` classified as 'removed' (lines 110-117)
+
+The order of checks is important: file headers are checked before general +/- classification, correctly excluding `---` and `+++` from being treated as removed/added lines.
+
+## Conclusion
+No code changes required. The issue was either already fixed before this bead was picked up, or the tests were written correctly from the start.