SW-111 — Add release dry-run artifact assertions

[dDevAhmed]

Summary

Strengthen release dry-run checks around package identity, version and artifact contents.

Acceptance Criteria

• dry-run asserts expected package/version/files;
• no registry publication occurs;
• failures are actionable;
• repository checks pass.

Dependencies

• SW-110

---

🏷 Labels

• Stellar Wave
• type: test
• area: release
• priority: P0
• difficulty: high
• points: 200
• workstream: release
• supply-chain