Add a pre-commit hook recipe

[venkatapgummadi]

Background

Many adopters want a quick way to run ASCEND's lighter checks locally before pushing. A precommit recipe lowers the adoption bar.

What needs to be done

Add a .pre-commit-hooks.yaml to the repo and a docs/pre-commit-recipe.md showing how to
add ASCEND lint and basic SAST hooks to a downstream project.

Definition of done

• .pre-commit-hooks.yaml valid against pre-commit.com schema
• docs/pre-commit-recipe.md created
• Linked from README
  Estimated effort: 2–3 hours · Skills needed: Python packaging, YAML