github/spec-kit ? reverse-engineered prompt

I want to build a toolkit that helps me create software using a "spec-driven development" approach. Instead of just vibe coding, I want a more structured process for working with an AI.

The core of this should be a Python CLI tool, let's call it specify. The workflow would be something like this: first, I define the project's core principles in a "constitution" file. Then, I'll write a high-level spec describing what the app should do in plain English. Based on that spec, the tool should generate a technical plan, break it down into a task list, and then execute the implementation to write the actual code.

The main idea is that the specification becomes the executable source of truth. It would also be great if the toolkit was extensible with presets and plugins. Let's start by building the main CLI and the core commands for the spec, plan, and implement phases.