Add public multi-marketplace distribution

[woksin]

Summary

Generates one public cratis-ai Distribution root that can be installed natively by generic Agent Skills/Agent Plugin hosts, Claude Code, Codex, GitHub Copilot, Gemini CLI, Kiro, and Pi. It also prepares exact OpenAI and Cursor portal handoffs without inventing owner identity or legal metadata.

Added

• Generate deterministic multi-marketplace manifests and 34 canonical public skills.
• Stage a complete protected Distribution repository and run all seven Distribution checks.
• Prepare deterministic OpenAI skills-only ZIP and Cursor submission metadata.
• Add a read-only workflow that uploads the exact review tree and portal handoffs.

Changed

• Extend generated-repository verification for public evaluation marketplace provenance and byte parity.
• Record self-hosted channels separately from owner-authenticated vendor portal handoffs.

Security

• Preserve blocked targets, repository-only skills, and native non-skill component boundaries.
• Keep scripts, dependencies, credentials, behavior support, stable promotion, and support claims absent.