ci: update GitHub Actions to checkout@v6

ci: publish to GitHub Packages registry

docs: add raw path docs reference

chore(release): configure npm publishing

docs: update test count to 250

docs: use pnpm dlx in supergateway example

test: add real server placeholder integration

chore: update README.md, config.yaml, docs/raw-path-placeholders.md

docs: fill CLAUDE.md gaps (conventions, security, testing, patterns)

test: add raw path parameter edge case tests