Remove hardcoded cpus_per_task=128 in landice mesh_gen cases

[Copilot]

• Identify duplicated from compass.landice.mesh import (...) patterns in landice mesh step files
• Attempt baseline lint/smoke checks (pre-commit, compass CLI); environment missing required tools/dependencies
• Replace repeated symbol-list imports with a single module import alias in affected files
• Update references (LandiceMeshStep and mesh utility function calls) to use the module alias
• Run available validation checks after edits
• Summarize changes and any validation limitations

[trhille]

This produces a lot of repeated code. Let's move constrain_resources() to compass/landice/mesh.py and import it for use in each mesh_gen case.
Also, we might still need to set min_cpus_per_task=1 (or possibly the min of 128 and available_resources['cores']?)

[Copilot]

This produces a lot of repeated code. Let's move constrain_resources() to compass/landice/mesh.py and import it for use in each mesh_gen case.
Also, we might still need to set min_cpus_per_task=1 ...

Done. The constrain_resources function is now in compass/landice/mesh.py — it calls Step.constrain_resources (via a local import to avoid circular imports) then sets self.cpus_per_task = available_resources['cores']. Each of the 7 step files imports and delegates to it in a one-liner override. The min_cpus_per_task defaults to 1 (the Step.__init__ default), which is correct here since we want to accept any number of available cores.