Add Product Spec Extension to community catalog

[mnriem]

Add Product Spec Extension to community catalog

Adds the Product Spec Extension (product) submitted by @d0whc3r to:

• extensions/catalog.community.json (alphabetical order)
• docs/community/extensions.md community extensions table

Validation Summary

Check	Result
Repository exists and is public	✅
extension.yml manifest present	✅
README.md present	✅
LICENSE file present	✅ (MIT)
GitHub release exists matching version	✅ v0.1.3
Download URL accessible	✅ product-0.1.3.zip asset on release
Extension ID lowercase-with-hyphens	✅ product
Version follows semver	✅ 0.1.3
Submission checklists all checked	✅

Extension Details

• ID: product
• Name: Product Spec Extension
• Version: 0.1.3
• Author: spec-kit-product contributors
• Repository: https://github.com/d0whc3r/spec-kit-product
• Commands: 4 | Hooks: 6
• Category: docs | Effect: Read+Write

Closes #2700
cc @d0whc3r

[Copilot]

Pull request overview

Adds the community-submitted Product Spec Extension (product) to Spec Kit’s community extension catalog and documentation, making it discoverable via the JSON catalog and the community extensions list.

Changes:

• Added the product extension entry to extensions/catalog.community.json (including metadata, URLs, and capability counts).
• Updated the catalog updated_at timestamp.
• Added the Product Spec Extension row to docs/community/extensions.md in the community extensions table.

Show a summary per file

File	Description
extensions/catalog.community.json	Adds the product extension to the community catalog and updates the catalog timestamp.
docs/community/extensions.md	Adds Product Spec Extension to the community extensions table in alphabetical position.

Copilot's findings

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

[mnriem]

Thank you!