Checkpoint Stage 2.6A-FIX

Status STAGE2_6A_FIX_FAIL_HARDCODE_STILL_DANGEROUS. Do not proceed 2.6B. Blockers: bad parity tiers, missing-signal not_in_set pass, ignored rule semantics, incomplete plan hash, spoofable signoff, readiness literals, writer bypass, no scale automation. Next BIRTH_STAGE2_6A_FIX2_QT001_POLICY_COMPLETE_PLAN_FAIL_CLOSED_RULES_EXACT_SIGNOFF_AND_AUTHORITY_LOCKDOWN. MCP readback PASS. Post-upload: targets8, origin0, permits0, done0, readiness BLOCKED, hardcode FAIL, cross-layer9/9.