[roytsmart]

The docstrings of e2v_ccd64_thick and e2v_ccd64_thin in optika.sensors.materials.depletion write the unit of resistivity as :math:`\Omega`-cm in a plain string, where \O is an invalid escape sequence. Python keeps the backslash, so the docs are right, but it prints a SyntaxWarning each time it compiles either module, as on the first import optika after an install from source:

_e2v_ccd64_thick.py:16: SyntaxWarning: invalid escape sequence '\O'

and a future Python will make it an error. This makes both docstrings raw, as optika's other docstrings with LaTeX in them are, and their text is unchanged. It has been there since #124.

It also adds W605 (invalid escape sequence) to the rules ruff checks, so this can't come back. On main it finds these two and nothing else.

Both functions are cached by optika.memory, which keys on their source, so the first call after this fits each model again.

Checks

• ruff (with W605) and black pass.
• The docstrings parse to the same text as on main.
• Every module of optika compiles with warnings as errors.
• The 24 tests of optika/sensors/materials/depletion pass.

🤖 Generated with Claude Code

https://claude.ai/code/session_011Bbxi6Vw6U8Q4gVCXHfEyN

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 100.00%. Comparing base (b5ffed9) to head (022eb04).

Additional details and impacted files

@@            Coverage Diff            @@
##              main      #268   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files          129       129           
  Lines        10540     10540           
=========================================
  Hits         10540     10540           

Flag	Coverage Δ
unittests	100.00% <ø> (ø)

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