Without this guard any client could send X-Forwarded-For: <spoofed-ip>
and bypass per-IP rate limiting entirely.
Also switches expireAfterWrite → expireAfterAccess so the 1-minute
window starts at first request, not last, and fixes the .gitignore
entry that accidentally merged **/test-results/ and .worktrees/ into
one broken pattern.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>