[extension] Update MAQA — Multi-Agent & Quality Assurance extension to v0.3.1 - #4544

Update the existing maqa community catalog entry for MAQA 0.3.1, preserving its original created_at, downloads, and stars values.

Validation results: all submission checks passed. The issue title uses the required [Extension]: prefix; the extension ID and version are valid; all required testing and submission checkboxes are checked; the public repository contains extension.yml, README.md, and LICENSE; the pinned download URL matches the submitted repository and maqa-v0.3.1 tag; the GitHub release exists with an uploaded maqa.zip asset and published SHA-256 digest; and the manifest confirms five commands, one hook, the Spec Kit requirement, and required git/gh tools.

Updated files:

• extensions/catalog.community.json with the v0.3.1 metadata and current timestamp
• docs/community/extensions.md with the refreshed community extension description

Closes #4452

cc @GenieRobot

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