[extension] Add ProductShape PRODUCT workflows extension to community catalog

[github-actions]

Adds the new pdac-product community extension to the catalog and Community Extensions documentation.

Validation completed:

• Issue title starts with [Extension]:.
• Extension ID pdac-product matches the lowercase-hyphen format.
• Version 0.1.0 matches the required semver format.
• The public repository contains the extension extension.yml, README.md, and LICENSE files, plus all six declared command files.
• The submitted release tag speckit-pdac-product-v0.1.0 exists and contains the submitted download asset.
• The download URL matches the permitted GitHub release asset pattern.
• All required testing and submission checklist items are checked.
• Catalog JSON validates successfully; the new entry is ordered by ID and the documentation row is ordered by extension name.

Closes #4453

cc @juangcarmona

Prepared by GitHub Copilot (model: gpt-5.2-codex, autonomous) on behalf of @mnriem.

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