feat(marketplace): implement plugin marketplace

Implements a new plugin marketplace structure and expands repository
support beyond basic skills to include plugins, MCPs, hooks, etc.

dist/agy/ship-it/plugin.json

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+{
+  "name": "ship-it",
+  "description": "Runs a comprehensive pre-flight audit, syncs the README, and publishes the changes to a new PR."
+}

dist/agy/ship-it/skills/ship-it/SKILL.md

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+---
+name: ship-it
+description: Runs a comprehensive pre-flight audit, syncs the README, and publishes the changes to a new PR.
+version: 1.0.0
+user-invocable: true
+author: Rootiest
+---
+
+# /ship-it
+
+Instructions:
+Execute the following two phases sequentially. Do not proceed to Phase 2 unless Phase 1 completes successfully.
+
+1. Phase 1: Documentation Sync & Code Audit
+   - Act as the `/docs-sync-audit` skill.
+   - Scan all file changes since the last README edit and update the README to ensure it accurately reflects the current state of the codebase.
+   - Audit all code files for any syntax errors, regressions, or issues.
+   - CRITICAL: If any code errors or breaking issues are discovered during the audit, HALT the workflow immediately and report them to the user. Do not proceed to publishing.
+
+2. Phase 2: Git Publish Workflow
+   - Act as the `/git-publish-workflow` skill.
+   - Create a new, descriptively named git branch.
+   - Stage and commit all pending changes (including the newly updated README from Phase 1).
+   - Push the branch to the remote repository.
+   - Generate a Pull Request (PR) from the new branch into 'main'.