Use prek

[joostlek]

Migrates from pre-commit to prek, mirroring the migration in python-trmnl.

• Move builtin pre-commit-hooks (check-case-conflict, check-json, check-yaml, end-of-file-fixer, trailing-whitespace, no-commit-to-branch, etc.) from local system hooks into a builtin repo block
• Replace pre-commit with prek in dev dependencies
• Split linting workflow: new prek-builtin-hooks job installs prek via pipx (no Poetry/Python deps required); other jobs switched from pre-commit run to prek run
• Update README references
• Add [*.yaml] indent_size = 2 to .editorconfig

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 100.00%. Comparing base (1d36da1) to head (f971dce).

Additional details and impacted files

@@            Coverage Diff            @@
##              main      #859   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files            6         6           
  Lines          245       245           
  Branches        14        14           
=========================================
  Hits           245       245           

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