new layout

[jeromekelleher]

• Migrate to dependency-groups, update Python floor to 3.11, add ruff config
• Add prek.toml for standard linting configuration
• Add uv.lock
• Replace all workflows with standard shared-workflow approach
• Remove legacy pre-commit configuration

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 100.00%. Comparing base (a14b511) to head (f48cad1).
⚠️ Report is 7 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff            @@
##              main      #171   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files            8         8           
  Lines          351       348    -3     
  Branches        43        43           
=========================================
- Hits           351       348    -3     

Flag	Coverage Δ
python-tests	100.00% <100.00%> (?)

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