Fix integral zmin/zmax never initialized (copy-paste of ymin/ymax)

[sbryngelson]

Summary

Severity: CRITICAL — 3D volume integrals use garbage z-bounds.

File: src/simulation/m_global_parameters.fpp, lines 817-818

The initialization loop for volume integral bounds repeats ymin/ymax on the lines that should set zmin/zmax, a copy-paste error from the y-bounds initialization just above.

Before

integral(i)%xmin = dflt_real
integral(i)%xmax = dflt_real
integral(i)%ymin = dflt_real
integral(i)%ymax = dflt_real
integral(i)%ymin = dflt_real   ! should be zmin
integral(i)%ymax = dflt_real   ! should be zmax

After

integral(i)%xmin = dflt_real
integral(i)%xmax = dflt_real
integral(i)%ymin = dflt_real
integral(i)%ymax = dflt_real
integral(i)%zmin = dflt_real
integral(i)%zmax = dflt_real

Why this went undetected

Only affects 3D simulations that use volume integral diagnostics. The y-bounds are initialized twice (harmlessly), masking the fact that z-bounds are never set.

Test plan

• Run 3D simulation with volume integral output and verify z-bounds

🤖 Generated with Claude Code

Fixes #1198

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Nitpicks 🔍

🔒 No security issues identified

⚡ Recommended areas for review GPU/device consistency The integral array fields are initialized on the host here but I could not find corresponding GPU declarations/updates for these fields. If integral is accessed on device kernels, ensure the device-side declaration/synchronization ($:GPU_DECLARE/$:GPU_UPDATE or equivalent) includes the integral bounds to avoid stale/uninitialised values on the device. Initialization coverage The PR fixes an obvious copy-paste bug by initializing integral(i)%zmin/zmax. Confirm there are no other similar copy-paste misses for other derived-type fields or other initialization loops (e.g., newly added/other bounds elsewhere, or any post-input reinitialization paths). Also check that all code paths that rely on integral z-bounds are tested (including cases with p==0 or 2D runs).

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Pull request overview

This PR fixes a copy-paste error in the volume integral initialization code where z-axis bounds were incorrectly set to y-axis bounds, leaving zmin and zmax uninitialized.

Changes:

• Corrected initialization of integral(i)%zmin and integral(i)%zmax to use zmin/zmax instead of the duplicated ymin/ymax

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 44.05%. Comparing base (84c46e0) to head (97e530d).

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #1177   +/-   ##
=======================================
  Coverage   44.05%   44.05%           
=======================================
  Files          70       70           
  Lines       20498    20499    +1     
  Branches     1990     1990           
=======================================
+ Hits         9030     9031    +1     
  Misses      10329    10329           
  Partials     1139     1139           

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