ci(release): publish mcp package to npm and GitHub Packages

[dejaguarkyng]

Summary

• bump @jungle-grid/mcp to 0.1.9
• add release-triggered validation and publication workflow for npmjs and GitHub Packages
• document the release/publishing path while keeping npmjs as the normal install source

Validation

• docker run --rm -v "/home/invinc/code/Jungle-grid main/junglegrid-mcp-server":/work -w /work node:24 bash -lc 'npm ci && npm run build && npm test && npm pack --dry-run'
• docker run --rm node:24 npm view @jungle-grid/mcp version --registry=https://registry.npmjs.org
• ruby YAML parse for .github/workflows/publish.yml