Use mocks for unsupported platform test

[Dreamsorcerer]

This allows the test to actually run in CI.

[greptile-apps]

Greptile Summary

This PR makes the Unity unsupported-platform test run consistently in CI.

• Adds a module import so the test can patch the platform helpers used by Unity validation.
• Replaces the host-dependent skip with parametrized mocked platform cases.
• Covers both non-Linux and non-x86_64 rejection inputs.

Confidence Score: 5/5

This looks safe to merge.

• No blocking issues found in the changed code.

Important Files Changed

Filename	Overview
dimos/simulation/unity/test_unity_sim.py	Updates the unsupported-platform test to use mocked platform values instead of relying on the CI host platform.

_{Reviews (2): Last reviewed commit: "Update test_unity_sim.py" | Re-trigger Greptile}

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ All tests successful. No failed tests found.

@@            Coverage Diff             @@
##             main    #2765      +/-   ##
==========================================
- Coverage   72.22%   72.14%   -0.09%     
==========================================
  Files         936      936              
  Lines       83188    83191       +3     
  Branches     7544     7544              
==========================================
- Hits        60083    60014      -69     
- Misses      21112    21172      +60     
- Partials     1993     2005      +12     

Flag	Coverage Δ
OS-ubuntu-24.04-arm	64.43% <100.00%> (-0.01%)	⬇️
OS-ubuntu-latest	67.04% <100.00%> (+0.01%)	⬆️
Py-3.10	67.02% <100.00%> (+<0.01%)	⬆️
Py-3.11	67.02% <100.00%> (+0.01%)	⬆️
Py-3.12	67.02% <100.00%> (+<0.01%)	⬆️
Py-3.13	67.03% <100.00%> (+0.01%)	⬆️
Py-3.14	67.03% <100.00%> (-0.01%)	⬇️
Py-3.14t	67.02% <100.00%> (+0.01%)	⬆️
SelfHosted-Large	30.24% <60.00%> (+0.01%)	⬆️
SelfHosted-Linux	38.11% <60.00%> (+0.06%)	⬆️
SelfHosted-macOS	36.44% <60.00%> (+<0.01%)	⬆️

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Files with missing lines	Coverage Δ
dimos/simulation/unity/test_unity_sim.py	95.22% <100.00%> (+0.05%)	⬆️

... and 5 files with indirect coverage changes

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[leshy]

I think we are actually deleting this sim?

[Dreamsorcerer]

I think we are actually deleting this sim?

Regardless, it's a small adjustment. If it gets deleted soon, nothing lost.