Add Claude plugin manifests for all plugins

[Evangelink]

Summary

• add .claude-plugin/plugin.json to all 15 plugins that were missing it
• make the root manifest authoritative and regenerate missing or drifted Claude copies during version sync
• extend CI and contributor guidance so new plugins cannot omit or desynchronize the Claude manifest

Fixes #1029

[github-actions]

⏭️ No skills to evaluate — no changed skills with tests were found in this PR. View workflow run

[Copilot]

Copilot encountered an error and was unable to review this pull request. You can try again by re-requesting a review.

Note

This error may be related to your runner configuration. You can now configure runners for Copilot code review separately from Copilot cloud agent by creating a copilot-code-review.yml file with your setup steps. Read the docs for details.

[github-actions]

✅ Evaluation passed for 3829685. cc @AbhitejJohn @JanKrivanek @webreidi @dotnet/aspnet @Redth @jfversluis @dotnet/skills-maui-reviewers @dotnet/area-infrastructure-libraries @kartheekp-ms @YuliiaKovalova @dotnet/dotnet-testing @dotnet/skills-csharp-language-reviewers — please review.

[AbhitejJohn]

You beat me to it! Thanks for fixing. I'm hoping we'd be able to simplify some of this once we move over to Agent Plugins 1.0 #1006 .

[github-actions]

✅ Approved by @AbhitejJohn. cc @dotnet/skills-merge-approvers — ready to merge.

[Copilot]

Review details

Suppressed comments (1)

.github/workflows/plugin-versioning-tests.yml:18

• Same as above for the push trigger: add .codex-plugin/plugin.json so main-branch Codex manifest-only updates still execute the versioning regression tests.

      - "eng/version/**"
      - "plugins/*/plugin.json"
      - "plugins/*/.claude-plugin/plugin.json"

• Files reviewed: 21/21 changed files
• Comments generated: 1
• Review effort level: Lite