chore: add Claude Code plugin marketplace entry + report gen plugin

[viktormarinho]

Summary by cubic

Added a Claude Code plugin marketplace entry and a new GitHub Repo Reports plugin that generates structured Markdown reports for repository health via a /generate-report command.

• New Features

  • Added marketplace entry (decocms-mcps) registering the github-repo-reports plugin.
  • Introduced github-repo-reports v1.0.0 with a slash command to create YAML-frontmatter reports (metrics, tables, statuses).
  • Included SKILL.md spec, README, and example reports with categories, status refs, and suggested Git workflow.

• Migration

  • Install via marketplace: /plugin install github-repo-reports. For local testing, point Claude Code at github-repo-reports-plugin.

^{Written for commit b5e8466. Summary will update on new commits.}

[cubic-dev-ai]

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