Context

Set up pre-commit hooks for local development quality gates and Dependabot for automated dependency updates.

Acceptance Criteria

• .pre-commit-config.yaml with hooks for: linting, formatting, type checking, trailing whitespace, YAML validation
• pre-commit installable via package manager
• .github/dependabot.yml for Python dependencies (weekly)
• Dependabot configured for GitHub Actions updates

Dependencies

• Evaluate and configure linting/formatting toolchain (ruff/black/isort) #23 (linting tool must be chosen first)