[node][release] Add npm publish pipeline and release policy

[midagedev]

Objective

Add npm publication pipeline for Node adapter package.

Deliverables

• GitHub Actions workflow for package publish (tag/manual)
• npm provenance/signing configuration where applicable
• semver/versioning policy aligned with core jongodb
• release checklist updates (Java + Node artifacts)

Success Criteria

• dry-run publish succeeds in CI
• first prerelease publish documented end-to-end
• rollback/unpublish contingency documented

Parallel Notes

• Ownership: CI/release/docs only
• avoid editing runtime implementation files

PR Checklist

• include review comments and follow-up commit before merge
• include workflow run URL proving dry-run success

Depends On

• Epic [EPIC][node] Publish Node.js adapter package for jongodb #106
• Scaffold [node][scaffold] Create @jongodb/memory-server package skeleton #107

[midagedev]

Status: in progress. Starting npm release workflow draft and checklist updates, isolated from runtime code.

[midagedev]

Implementation started in PR #113. Scope: Node adapter release workflow draft and release checklist gate.