docs(bf-30p4): document test verification - all FileContextPanel tests passing

Investigation found that all 57 FileContextPanel tests are passing.
The issues described in the bead were already fixed in the original
implementation (bd-2u6). No code changes required.

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

notes/bf-30p4.md

@@ -0,0 +1,43 @@
+# bf-30p4: FileContextPanel Test Failures - Already Fixed
+
+## Task Description
+Fix 29 test failures in src/tui/components/FileContextPanel.test.ts covering:
+- constructor: key handlers not bound on construction
+- setContextFromEvent: scroll offset not reset on new context
+- setContent: render not triggered when updating current file
+- syntax highlighting: TS/JS/Python/Rust/unknown file type detection
+- operation icons: read/edit/write/glob icon selection
+- recent files navigation: prev/next file navigation
+- show/hide/toggle: panel visibility methods
+- focus: focus() not delegating to box element
+- getElement: getElement() method missing or returning wrong element
+- clear: render not triggered after clear
+- key bindings: scroll up/down/page keys, open-in-editor key not bound
+- render output: no-file message, file path in header, directory path, operation history
+- regression: operation type detection
+
+## Investigation
+
+Ran the test suite and found that all 57 FileContextPanel tests are passing:
+```
+✓ src/tui/components/FileContextPanel.test.ts (57 tests) 58ms
+```
+
+Full test suite: 2399 tests passed, 4 skipped.
+
+## Conclusion
+
+The FileContextPanel implementation (added in commit 629d743 `feat(bd-2u6): File Context Panel`) was already written with all the test expectations in mind. All methods and features tested are correctly implemented:
+
+- Key bindings are properly bound in `bindKeys()` method called from constructor
+- `setContextFromEvent()` resets scroll offset, tracks operations, limits history
+- `setContent()` triggers render when updating current file
+- Syntax highlighting via `getLanguage()` and `highlightCode()` methods
+- Operation icons via `getOperationIcon()` method
+- Recent files navigation via `navigateRecent()` method
+- `show()`, `hide()`, `toggle()`, `isVisible()` all working
+- `focus()` delegates to `this.box.focus()`
+- `getElement()` returns `this.box`
+- `clear()` resets all state and triggers render
+
+The bead appears to have been created based on outdated information or was a duplicate of work already completed in bd-2u6.