ME-RV-087 — Candidate promotion record

[fraware]

Summary

schemas/promotion-record.schema.json + validate_registry.py enforcement; stable impossible without signed record.

Normative: 12_REGISTRY_GOVERNANCE_ADOPTION.md (ME-RV-087)

Done in-repo

• Schema added; registry/promotions/ directory; validator gate for status=stable.

Acceptance

• Mechanical refusal of stable without valid signed record
• First candidate (not stable) promotion packet when readiness reached
• Do not claim stable promotion complete