07 Hardcode Guard v4 Audit

Verdict HARDCODE_GUARD_V4_FAIL. Live status PASS_WITH_ROUTED_2_6B/pass=true while writer/builder remain v5/v2/old-signoff; arbitrary authority identities and free-text capability proof pass; invalid BLOCK governance is ignored; fingerprint tests are synthetic/NULL-to-zero; PUBLIC/Directus remain open. V4 is a dangerous false-green.