🚀 Configure release-it

[IsaacInsoll]

Summary

• exact-pin release-it 21.0.0 and use an unpublished 0.0.0-development baseline
• validate synchronized main and curated changelog notes before one atomic release commit/tag push
• keep npm publishing and GitHub Release creation in the future tag workflow
• run the complete local release gate before release-it mutates package versions
• keep routine release-it updates manually coordinated

Verification

• npm run release:check
• npm run format:check
• npm run lint
• npm run typecheck
• npm test (67 tests)
• isolated no-tag and existing-tag preflight checks
• isolated atomic 1.0.0-rc.0 release to a local bare remote
• root and packed-consumer audits report zero vulnerabilities