[extension] Update Multi-Model Review extension to v0.1.2

[github-actions]

Update the multi-model-review community catalog entry from 0.1.1 to 0.1.2.

Changes

• extensions/catalog.community.json: updated version, download_url, and updated_at for multi-model-review; refreshed top-level updated_at
• docs/community/extensions.md: no change needed (description and row are unchanged)

Validation Results

All checks passed:

• ✅ Extension ID multi-model-review matches ^[a-z][a-z0-9-]*$
• ✅ Version 0.1.2 follows semver (X.Y.Z)
• ✅ Repository formin/multi-model-review is public and accessible
• ✅ extension.yml present in repository
• ✅ README.md present in repository
• ✅ LICENSE present in repository
• ✅ GitHub release v0.1.2 exists
• ✅ Download URL follows archive/refs/tags/v0.1.2.zip pattern
• ✅ All Testing Checklist items checked
• ✅ All Submission Requirements checked
• ✅ JSON validated with python3 -c "import json; json.load(open(...))" — valid

Preserved fields

created_at: 2026-05-04T02:51:52Z, downloads: 0, stars: 0

Closes #3065

cc @formin

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