Add pre-commit hooks for linting and formatting

[RBhupi]

Area

Other / cross-cutting

Motivation

Developer experience — improves development or testing

Problem

Scope

Introduce local pre-commit enforcement.

Proposed solution

Tasks

• Add ruff (lint + import sorting)
• Add black (formatting)
• Add optional isort only if ruff config is insufficient
• Add yaml + whitespace + EOF checks
• Ensure hooks run fast (<5–10s target)

Done

• Hooks installed via pre-commit
• Developer runs pre-commit before CI

Alternatives considered

No response

Additional context

No response

Checklist

• I searched existing issues and this has not been requested before
• This is one focused request, not multiple features bundled together