Add Loop Engineering extension to community catalog

[mnriem]

Adds the Loop Engineering (loop) extension submitted by @formin to the community catalog.

Validation

• ✅ Repository public: https://github.com/formin/spec-kit-loop
• ✅ extension.yml, README.md, LICENSE present
• ✅ GitHub release v1.0.0 exists
• ✅ Download URL returns 200 application/zip (archive/refs/tags/v1.0.0.zip)
• ✅ Extension ID loop matches ^[a-z][a-z0-9-]*$
• ✅ Version 1.0.0 is valid semver
• ✅ Manifest: 5 commands, 2 hooks, category process, effect read-write
• ✅ JSON validated

Changes

• extensions/catalog.community.json — new entry inserted alphabetically
• docs/community/extensions.md — community extensions table row added

Closes #2977

cc @formin

[Copilot]

Pull request overview

Adds the Loop Engineering (loop) community extension to Spec Kit’s community extension catalog, making it discoverable/instalable via the published catalog and documented in the community extensions list.

Changes:

• Added a new loop entry to extensions/catalog.community.json with metadata (URLs, version, tags, requires/provides, timestamps).
• Added a corresponding “Loop Engineering” row to docs/community/extensions.md in the community extensions table.

Show a summary per file

File	Description
extensions/catalog.community.json	Adds the new loop extension record in the correct alphabetical position (between linear and m365).
docs/community/extensions.md	Adds the “Loop Engineering” row in the extensions table in alphabetical order (between “Linear Integration” and “MAQA …”).

Copilot's findings

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• Files reviewed: 2/2 changed files
• Comments generated: 0