Feature/issue 9155/pre commit cleanup

[igorhrcek]

Note

Introduces a Nix flake dev shell and lefthook-based Git hooks, removes pre-commit config, and updates .envrc and .gitignore.

• Tooling / Dev Environment:
  • Nix Flake: Add flake.nix and flake.lock providing a dev shell with lefthook, terraform, and go-task.
  • Git Hooks: Add lefthook.yml (remote config + black pre-commit); remove .pre-commit-config.yaml.
  • Direnv: Update .envrc to use flake and run lefthook install.
• Repository Hygiene:
  • Update .gitignore to ignore .direnv/ and doctester.py.

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[cursor]

Bug: Black formats entire directory instead of staged files

The run: black . command formats all Python files in the repository, not just staged files. The original pre-commit configuration only formatted staged Python files. In lefthook, the glob option filters which files trigger the hook, but run: black . still operates on the entire directory. To replicate the original behavior, the command needs to use {staged_files} placeholder like run: black {staged_files} to only format staged files.