Implement argparse CLI

[soumendrak]

Summary

• implement a fully working argparse-based CLI
• rewrite CLI tests for subcommands
• document command line usage

Testing

• pytest -q

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https://chatgpt.com/codex/tasks/task_e_685ffe31e644832e9aba2a0997d145f8

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Latest commit:	9aa185d
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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 99.49%. Comparing base (ac2db15) to head (9aa185d).

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #185   +/-   ##
=======================================
  Coverage   99.49%   99.49%           
=======================================
  Files           9        9           
  Lines         199      199           
=======================================
  Hits          198      198           
  Misses          1        1           

Flag	Coverage Δ
pytest	99.49% <ø> (ø)

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