fix(release): use valid V2 npm dist-tag

[dancormier]

Summary

• replace the invalid v2 npm dist-tag with legacy-v2
• validate the release tag before publishing
• add CI coverage preventing SemVer-like dist-tags
• document the V2 maintenance release tag

npm rejects v2 because it parses as a semantic-version range. Without this correction, future V2 releases would fail during publication.

Testing

Automated and local verification:

• npm ci
• npm run test:release-config
• npm run build
• npm run lint
• npx eslint scripts
• focused formatting checks

Material reviewer checks that do not publish packages:

1. Run node scripts/validate-npm-dist-tag.mjs legacy-v2 and confirm it exits successfully.
2. Run node scripts/validate-npm-dist-tag.mjs v2 and confirm it exits non-zero with an invalid or SemVer-like tag error.
3. Inspect package.json and confirm release:v2 validates and publishes the same single legacy-v2 tag.
4. Inspect the CI matrix and confirm Release Config Tests runs before any future V2 release can pass CI.

Do not run npm run release:v2 during review; it is the real package publication command.

After this PR merges, adding legacy-v2 to the already-published Classic 2.9.0 and Svelte 0.7.0 packages will be handled as a separately approved npm registry mutation. Verification will confirm that legacy-v2 resolves to those versions while latest remains unchanged.

Jira

STACKS-846

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Latest commit: 34fc785

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