[bundle] Update SpecAssay bundle to v0.4.12

[github-actions]

Updates the specassay entry in bundles/catalog.community.json from v0.3.4 to v0.4.12.

Changes

• bundles/catalog.community.json: updated specassay entry — version, download_url, and updated_at timestamp
• docs/community/bundles.md: no row changes needed (description and provides counts are unchanged)

Validation summary

All checks passed:

• Bundle ID specassay matches ^[a-z0-9](?:[a-z0-9._-]*[a-z0-9])?$ ✅
• Version 0.4.12 is valid semver X.Y.Z with no v prefix, and is higher than the existing catalog version 0.3.4 ✅
• Repository https://github.com/rdryfoos/specassay is a public GitHub URL containing bundle.yml, README.md, and LICENSE ✅
• bundle.yml fields (id, name, version, role, author, license, speckit_version, provides) all match the submission ✅
• Release v0.4.12 exists with specassay-0.4.12.zip attached ✅
• Download URL is a valid HTTPS GitHub release asset URL under the submitted repository ✅
• Catalog entry has all required fields, verified: false, and 5 valid lowercase tags ✅
• Required component catalogs (extensions + presets) are listed, documented in the README, and confirmed tested ✅
• All checklists checked; testing details describe validation, build, artifact installation, and clean-project testing ✅
• Example usage includes artifact installation and required catalog setup commands ✅

This validation confirms that submission metadata is complete and correctly formatted. It is not a security audit or endorsement of the bundle code or installed components.

Closes #4255
cc @rdryfoos

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