v1.5.9 — AML/KYC adversarial hardening (32 tests)

ACAMS 2026 procurement lane hardening. 32 new tests: every AML flag + KYC status fires independently with correct citation; block wins over escalate; kyc_status × aml_flags cross-dimension; unknown-flag escalate fail-safe (never silent drop); tipping-off compliance (rationale must NOT contain raw flag key string, AA06 label must NOT name OFAC/SDN); confidence tiering 0.95/0.75/0.60; policy tables frozen. Bank compliance procurement teams read the test file. Tests 566 → 598 (+32).