docs: add execution model diagram, real cycle example, and spec→runti… #4

	name: Validate Spec Repository

	on:
	push:
	pull_request:

	jobs:
	validate:
	runs-on: ubuntu-latest

	steps:
	- name: Checkout repository
	uses: actions/checkout@v4

	- name: Set up Python
	uses: actions/setup-python@v5
	with:
	python-version: "3.12"

	- name: Install dependencies
	run: \|
	python -m pip install --upgrade pip
	python -m pip install -r requirements-dev.txt

	- name: Validate repository
	run: make validate

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