PASS: valid legacy long installation code
PASS: valid 7-character desktop installation code
PASS: lowercase desktop installation code accepted
PASS: surrounding spaces are ignored
PASS: 7-character alphanumeric code accepted
PASS: 6-character code rejected
PASS: short code with separator rejected
PASS: underscore rejected
PASS: invalid special character rejected
PASS: overlong installation code rejected
PASS: invalid installation code
PASS: month-end clamp
PASS: leap-year month-end clamp
PASS: annual duration
PASS: escaping prevents HTML injection
PASS: generated key format
PASS: AES-GCM encrypt-decrypt
PASS: canonical key HMAC
PASS: active license classification
PASS: expired license classification

All local self-tests passed. MySQL integration must be tested on deployment.