setup-pre-commit

# Setup Pre-Commit Sets up Husky + lint-staged + Prettier + optional type/test scripts. ## Steps 1. Detect package manager from lockfile. Default npm if unclear. 2. Install dev deps: `husky lint-staged prettier`. 3. Init Husky (`husky init` using detected package runner). 4. Write `.husky/pre-commit`: ```bash <pm> lint-staged <pm> run typecheck # only if script exists <pm> run test # only if script exists ``` 5. Create `.lintstagedrc`: ```json {"*":"prettier --ignore-unknown --write"} ``` 6. Create `.prettierrc` only if no Prettier config exists. 7. Verify hook executable, `prepare` script present, lint-staged works.