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