fix price spike check to use correct scaling and compare rates

[dpaiton]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 50.00000% with 3 lines in your changes missing coverage. Please review.

Project coverage is 81.84%. Comparing base (0971d8f) to head (23a9093).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
...c/agent0/hyperfuzz/system_fuzz/invariant_checks.py	50.00%	3 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1691      +/-   ##
==========================================
+ Coverage   81.77%   81.84%   +0.07%     
==========================================
  Files          99       99              
  Lines        7647     7650       +3     
==========================================
+ Hits         6253     6261       +8     
+ Misses       1394     1389       -5     

Flag	Coverage Δ
unittests	81.84% <50.00%> (+0.07%)	⬆️

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