Adds module-level 5s debounce (_is_debounced) with thread-safe dict +
GC. Inserts debounce guard in nfc_tap immediately after uid validation.
Adds TestTapEndpointErrors (6 tests): unknown_card, clock_disabled,
no_location_configured, kiosk_disabled, invalid_uid, debounce.
Adds setUp() to both tap test classes to clear _recent_taps between
tests, preventing cross-test debounce bleed. 29/29 pass.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
Adds /fusion_clock/kiosk/nfc/enroll (jsonrpc, auth=user) that validates
the enroll password, normalises the card UID, checks for duplicate
assignments, writes x_fclk_nfc_card_uid, and creates a card_enrollment
activity log entry. 4 new tests; 21 total passing.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
Add _normalize_uid static method to FusionClockNfcKiosk that strips
whitespace, uppercases, removes separators, validates hex-only content,
and reformats to canonical colon-separated pairs; returns None for
empty/invalid input. Covered by 7 new TransactionCase unit tests.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
