ci: upload release artifact files recursively

[scottconverse]

Summary

• Fix the v1.0.4 release workflow asset upload step so downloaded artifact directories do not get passed to gh release upload.
• Add stale-draft cleanup for the same tag while refusing to overwrite already-published releases.
• Extend the workflow test to lock the recursive file upload and draft safety behavior.

Root Cause

The release artifact download preserves the original dist/ directory. The workflow uploaded release-assets/*, so gh attempted to upload release-assets/dist as a file and failed after creating a partial draft release.

Validation

• python -m pytest tests\\test_github_workflows.py -> 2 passed.
• YAML parse of all .github/workflows/*.yml -> YAML_OK.
• git diff --check -> no whitespace errors.