Make article synthesizer package consumable

[gnanirahulnutakki]

Summary

• Commit generated dist/ output so GitHub archive installs satisfy the package export map.
• Switch @ardurai/contracts from GitHub shorthand/SSH resolution to the verified HTTPS archive dependency.
• Add build-only tsconfig, prepack, and package smoke coverage for root and ./contracts subpath imports.
• Update README package/API guidance to match current articles + heldArticles behavior.

Validation

• npm install
• npm test (102 passing)
• npm run typecheck
• npm run build
• npm run test:package
• npm pack --dry-run --json
• npm audit --audit-level=high
• git diff --check
• semgrep --config=auto --error --quiet package.json scripts/package-smoke.mjs
• Fresh consumer install/import from https://github.com/ArdurAI/ardur-article-synthesizer/archive/e7f106cddb919d6e145b298524cfc52f1bd6e517.tar.gz
• Dependency scan confirmed no git+ssh, ssh://git@github.com, or github: references remain in package metadata/lockfile.