test(pt): fix hessian regression follow-up

[njzjz-bot]

Problem

• PR fix(pt): address hessian review comments #227 was merged before the follow-up regression-test fix landed.
• The added Hessian regression test was still double-enabling Hessian mode, which caused a recursion failure.

Change

• Remove the redundant pre-enabled Hessian path from the new regression test.
• Keep the test in the standard model path and enable Hessian exactly once inside the helper.

Notes

• Follow-up to merged PR fix(pt): address hessian review comments #227.

Authored by OpenClaw (model: custom-chat-jinzhezeng-group/gpt-5.4)

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 82.26%. Comparing base (9b215f7) to head (8e7b038).
⚠️ Report is 2 commits behind head on fix-hessian-nan-dpa3.

Additional details and impacted files

@@                   Coverage Diff                    @@
##           fix-hessian-nan-dpa3     #228      +/-   ##
========================================================
+ Coverage                 82.17%   82.26%   +0.09%     
========================================================
  Files                       800      800              
  Lines                     82582    82582              
  Branches                   4066     4066              
========================================================
+ Hits                      67863    67938      +75     
+ Misses                    13503    13429      -74     
+ Partials                   1216     1215       -1     

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