agr publish: register skills in a central registry

[kasperjunge]

Summary

Add an agr publish command that registers skills in a central registry/index, making them discoverable via agr search. This could start as simple as registering a GitHub repo with metadata in a central index.

Why

Currently users must know the exact GitHub handle to install a skill. A registry enables discoverability and is essential for ecosystem growth. Complements a future agr search command.

Scope

• Design registry format and hosting (could be a GitHub repo with a JSON/TOML index, or a simple API)
• Implement agr publish command that validates and submits skill metadata
• Validate skill has required metadata (name, description, author)
• Consider: authentication, versioning, ownership verification
• Consider: integration with agentskills.io

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