Identifiers, the AutoFillExtension -> AutoFill rename, and the KDBX library choice had all drifted from the approved spec since it was written in May. Updates the spec to match what was actually built and closes the now-resolved "which KDBX library" open question. Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01WYqycDFsynHH9VnnK7LNSf