♻️ Create shield class

[chris-ashe]

Description

Checklist

I confirm that I have completed the following checks:

• My changes follow the PROCESS style guide
• I have justified any large differences in the regression tests caused by this pull request in the comments.
• I have added new tests where appropriate for the changes I have made.
• If I have had to change any existing unit or integration tests, I have justified this change in the pull request comments.
• If I have made documentation changes, I have checked they render correctly.
• I have added documentation for my change, if appropriate.

[codecov-commenter]

Codecov Report

❌ Patch coverage is 25.28736% with 65 lines in your changes missing coverage. Please review.
✅ Project coverage is 46.43%. Comparing base (5ea7543) to head (dd3cd61).
⚠️ Report is 7 commits behind head on main.

Files with missing lines	Patch %	Lines
process/shield.py	0.00%	48 Missing ⚠️
process/vacuum.py	63.63%	12 Missing ⚠️
process/blanket_library.py	0.00%	3 Missing ⚠️
process/caller.py	0.00%	1 Missing ⚠️
process/main.py	50.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #4064      +/-   ##
==========================================
- Coverage   46.49%   46.43%   -0.06%     
==========================================
  Files         123      124       +1     
  Lines       28777    28848      +71     
==========================================
+ Hits        13381    13397      +16     
- Misses      15396    15451      +55     

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