vcspull --help: Improve examples

[tony]

Summary

• add a formatter that colorizes CLI help example sections and apply it to the root parser plus all subcommands
• expand the bundled vcspull --help examples so each subcommand offers copy-pastable usage snippets
• keep CLI logger discovery output stable after the formatter refactor and document the improvements in CHANGES

Screenshot (Python 3.14)

Before

With PR

Testing

• uv run ruff check . --fix --show-fixes
• uv run ruff format .
• uv run mypy
• uv run py.test

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 79.36%. Comparing base (ee296a2) to head (2b0cf99).
⚠️ Report is 4 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #471      +/-   ##
==========================================
+ Coverage   79.26%   79.36%   +0.09%     
==========================================
  Files           9        9              
  Lines         656      659       +3     
  Branches      147      148       +1     
==========================================
+ Hits          520      523       +3     
  Misses         78       78              
  Partials       58       58              

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