The detect_xfa function was already implemented in the codebase at the
time of bead assignment. This note documents the verification of the
existing implementation against the bead's acceptance criteria.
All 6 tests pass, covering all acceptance criteria:
- XFA stream presence → true
- XFA array packet form → true
- No XFA key → false
- XFA null → false
- No AcroForm → false
- XFA as indirect reference → true
Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
