Add 6 release workflow templates that were missing from pdftract/.ci/argo-workflows/:
- pdftract-build-binaries.yaml: Cross-compile 5 arch binaries
- pdftract-crates-publish.yaml: Publish to crates.io with ordering
- pdftract-docker-build.yaml: Multi-arch Docker images
- pdftract-docs-build.yaml: mdbook to Cloudflare Pages
- pdftract-github-release.yaml: Populate GitHub Release page
- pdftract-node-publish.yaml: npm publish workflow
These templates already existed in declarative-config and are synced via ArgoCD.
The in-tree copies are now complete for all 10 release pipeline templates.
Verification: notes/bf-5o8cg.md
Closes: bf-5o8cg
