Submit OpenClaw output to ClawHub

Parent: #45

## Goal
Submit the generated OpenClaw output to ClawHub as the appropriate skill/package listing.

## Evidence
- OpenClaw: https://openclaw.ai
- OpenClaw repo: https://github.com/openclaw/openclaw
- ClawHub: https://clawhub.ai
- ClawHub repo: https://github.com/openclaw/clawhub
- ClawHub exposes Skills and Plugins catalogs and publish flows.
- Generated output merged in #52: `plugins/openclaw/`.

## Tasks
- Decide whether to publish as a ClawHub skill, native OpenClaw plugin/package, or both.
- Validate `plugins/openclaw/package.json`, `AGENTS.md`, `mcp.json`, and `skills/` against ClawHub requirements.
- Prepare the ClawHub submission or publish command.
- Record the submission URL/status back in #45.

Start by inspecting plugins/openclaw/package.json, AGENTS.md, mcp.json, and the skills/ directory, then compare them with the ClawHub Skills and Plugins catalogs and publishing requirements. Decide whether the output belongs as a skill, native OpenClaw plugin/package, or both. Done means the submission or publish command has been prepared or run and its URL/status is recorded on parent issue #45.

Written by the indexing model from the issue text.