feat: add "VS Code Ask Questions" preset

[fdcastel]

Closes #1657

Description

Adds a community preset that packages the vscode/askQuestions enhancement for /speckit.clarify

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 GitHub Copilot (Claude Opus 4.6 model) to fix the Copilot AI initial review on #1962.

[Copilot]

Pull request overview

Adds a new community preset entry for a “VS Code Ask Questions” clarify workflow, making it discoverable via the community preset catalog and README.

Changes:

• Added a new “VS Code Ask Questions” row to the community presets table in the README.
• Added a new vscode-ask-questions preset entry to presets/catalog.community.json with metadata, tags, and download links.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 4 comments.

File	Description
README.md	Adds the new community preset to the public-facing presets list.
presets/catalog.community.json	Registers the preset in the community catalog with versioned download/documentation links and tags.

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