Add skill file for Scapy packet, field, and layer patterns

[polybassa]

I hope this will help some AI-Generated contributions to have a better baseline quality.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 80.28%. Comparing base (65816b7) to head (273dbed).

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #4999      +/-   ##
==========================================
- Coverage   80.28%   80.28%   -0.01%     
==========================================
  Files         383      383              
  Lines       95159    95159              
==========================================
- Hits        76402    76398       -4     
- Misses      18757    18761       +4     

see 5 files with indirect coverage changes

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