Add release governance

[kfrrst]

Summary

• Adds a canonical VERSION and CHANGELOG.md for Tessellate release tracking.
• Adds release governance tooling for version checks, release preparation, and GitHub Release notes.
• Adds a manual GitHub Release workflow that validates the version contract before publishing vX.Y.Z.
• Documents curations, repo setup, and release expectations in the public integration surface.

Verification

• node scripts/release.mjs check --version 0.1.0
• node --test scripts/__tests__/*.test.mjs
• git diff --check

[gemini-code-assist]

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