[tuflow] Refine culvert mean reporting

[Chain-Frost]

Summary

• extend the culvert mean reporting workflow to include adopted discharge-based metrics plus per-group minima and maxima
• order the new values in the summary exports so the adopted, mean, minimum, and maximum columns remain grouped
• document the adopted, mean, minimum, maximum, and supporting columns in the shared column metadata registry

Testing

• python - <<'PY'
  from pathlib import Path
  from ryan_library.scripts.tuflow.tuflow_culverts_mean import run_culvert_mean_report

script_dir = Path('tests/test_data/tuflow/tutorials/Module_03/results/plot/csv').resolve()
run_culvert_mean_report(script_directory=script_dir, log_level="WARNING")
PY

• python repo-scripts/build_library.py --skip-pip (fails: missing build module in the execution environment)

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