Export portable syndication artifacts

[nori-sessions]

Summary

🤖 Generated with Nori

• add credential-free Article and post-collection exports for public Substack content
• paginate Note candidates, preserve exact copy/media, and emit versioned source-neutral artifacts
• make Git installation work without a TypeScript toolchain and keep committed dist synchronized in CI

Test Plan

• npm run build
• npm run lint
• npm test (52 tests)
• Git-dependency install executes nori-substack --help without dev dependencies

Share Nori with your team: https://www.npmjs.com/package/nori-skillsets