Implements a concrete first milestone for issue #14:\n\n- Adds artifact/versioning foundation schema\n- Adds metadata standards contract (JSON-LD/DataCite/schema.org)\n- Adds upload/versioning/execution API contract\n- Adds phased implementation plan\n\n@algora-pbc /claim #14

Demo video

• https://github.com/aimqwest/gyroflow/releases/download/aimqwest-pr-demos-20260512/pr35-demo-v6.mp4