[Extension]: Add Interactive HTML Preview v1.0.0

[bigsmartben]

Spec Kit Extension Submission

Extension ID: preview
Name: Interactive HTML Preview
Version: 1.0.0
Description: Generate self-contained interactive HTML prototypes from Spec Kit artifacts
Author: bigsmartben
Repository URL: https://github.com/bigsmartben/spec-kit-preview
Download URL: https://github.com/bigsmartben/spec-kit-preview/archive/refs/tags/v1.0.0.zip
Documentation URL: https://github.com/bigsmartben/spec-kit-preview/blob/main/README.md
License: MIT
Required Spec Kit version: >=0.8.10.dev0
Commands count: 1
Hooks count: 0
Tags: preview, prototype, html, ux

Key Features

• Adds speckit.preview.html.
• Generates specs/<feature>/preview/index.html.
• Keeps prototypes self-contained with inline CSS and JavaScript.
• Explicitly avoids production source, spec, plan, and task file changes.
• Captures prototype assumptions and unresolved questions.

Testing Performed

• python3 -m py_compile tests/validate-extension.py
• python3 tests/validate-extension.py
• Installed locally with specify extension add --dev /home/administrator/github/spec-kit-preview in a fresh Spec Kit project.
• Verified .qwen/commands/speckit.preview.html.md was registered.
• Verified installed extension contents excluded tests/ via .extensionignore.
• Created release v1.0.0.
• Installed release ZIP in a fresh Spec Kit project:
  specify extension add preview --from https://github.com/bigsmartben/spec-kit-preview/archive/refs/tags/v1.0.0.zip

[mnriem]

Thank you!