[audit] dead-code: Unused export isEditorFocused in src/utils/focus.ts

[claude]

Problem

src/utils/focus.ts exports a single function isEditorFocused() that is never imported by any production code.

Files:

• src/utils/focus.ts (entire file, ~18 lines)
• src/utils/focus.test.ts (tests for dead code)

Evidence: grep 'isEditorFocused' src/ only returns focus.ts and focus.test.ts. No production consumer exists.

Impact

Dead utility code with orphaned tests.

Suggested fix

Delete both focus.ts and focus.test.ts.