ME-RV-074 — Signed experimental release

[fraware]

Summary

0.x experimental prerelease with checks, SBOM, provenance, digests, signing, human approval.

Normative: 11_SECURITY_CI_RELEASE_TOOLCHAIN.md (ME-RV-074). Depends on all P0.

Scaffolding

• release.yml provenance/SBOM/digests; signing gaps documented honestly.

Acceptance

• Signed artifacts + human-approved prerelease
• Exact tag commit green on protected required checks

Blocked

Signing key, publish permissions, branch protection, P0 closure.