Add check-only pre-commit style gate with flake8

[Copilot]

This change introduces a commit-time style checklist via Git pre-commit hooks, aligned with the requirement to fail on style violations without auto-fixing files. It adds a repository-level pre-commit configuration and documents expected developer usage.

• Pre-commit style gate

  • Added .pre-commit-config.yaml with a flake8 hook pinned to 6.0.0.
  • Hook is configured for reporting/failure behavior only (no formatting or rewrite tools).

• Developer tooling

  • Added pre-commit==3.8.0 to requirements-dev.txt so contributors can install and use the hook consistently.

• Contributor documentation

  • Updated README.md with setup commands and explicit behavior: pre-commit reports style issues and does not modify files.

repos:
  - repo: https://github.com/pycqa/flake8
    rev: 6.0.0
    hooks:
      - id: flake8
        args: [--count, --max-complexity=10, --max-line-length=127, --statistics]

• Fixes precommit configuration #11

[alifa98]

Seems correct but I might need to add some other pre-commit hooks