docs: remove createVersionedResponse() reference from CHANGELOG

Remove documentation for createVersionedResponse() method that was
deleted from version-utils.ts as part of dead code cleanup. The method
was never called in the codebase and was only referenced in the
CHANGELOG.

This completes Task 3 of the utils coverage completion plan.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

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

CHANGELOG.md

@@ -279,7 +279,6 @@ This release implements safe write operations with concurrency control, partial
 - `generateVersionId()` - Create version ID from file mtime and size
 - `validateVersion()` - Check if provided version matches current
 - `versionMismatchError()` - Generate 412 Precondition Failed error
-- `createVersionedResponse()` - Add version info to responses
 - Uses SHA-256 hash with URL-safe base64 encoding
 
 **Enhanced Tool: `create_note`**