feat: register spec-kit-iterate extension

[imviancagrace]

Description

Register the Iterate extension (spec-kit-iterate) in the community catalog.

Spec Kit's core workflow (specify → plan → tasks → implement) doesn't have a built-in way to refine scope once implementation has started. This extension adds a two-phase define → apply workflow that lets users iterate on spec documents mid-implementation:

• /speckit.iterate.define — analyzes a change request against current spec state and implementation progress, writes a reviewable pending-iteration.md plan
• /speckit.iterate.apply — applies the pending iteration to all spec artifacts (spec.md, plan.md, tasks.md, etc.), so the user can go straight to /speckit.implement without re-running /speckit.plan or /speckit.tasks

Repository

Testing

• Tested locally with uv run specify --help
• Ran existing tests with uv sync && uv run pytest
• Tested with a sample project (if applicable)

AI Disclosure

• I did not use AI assistance for this contribution
• I did use AI assistance (describe below)

Used Cursor & Claude Code to help design the two-phase define/apply workflow and write the command prompt files + supporting documents.

[Copilot]

Pull request overview

Registers the new community extension spec-kit-iterate in Spec Kit’s community extension catalog, making it discoverable via the catalog/README listing.

Changes:

• Added a new iterate entry to extensions/catalog.community.json with metadata and download URL.
• Added Iterate to the “Available Community Extensions” table in extensions/README.md.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 3 comments.

File	Description
extensions/catalog.community.json	Adds the new iterate extension definition to the community catalog.
extensions/README.md	Adds Iterate to the community extensions list for documentation/discovery.

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[Copilot]

Pull request overview

Registers the new community extension spec-kit-iterate in Spec Kit’s community extension catalog so users can discover it and add it to their own curated catalogs.

Changes:

• Added the iterate extension entry to extensions/catalog.community.json (metadata, tags, URLs, version, requirements).
• Added the Iterate row to the community extensions table in extensions/README.md.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 1 comment.

File	Description
extensions/catalog.community.json	Adds the iterate extension metadata to the community catalog for discovery.
extensions/README.md	Lists Iterate in the community extensions table for documentation/discovery.

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