fix(selection): redact hostile model-comparison input failures

[seonghobae]

Summary

• Model-comparison parameter counts and casewise iterables redact hostile conversion/iteration callbacks into stable package-owned ValueErrors.
• Preserves MemoryError.
• Stacked on fitstats/docs fail-closed base for product CI.

Supersedes

• Closes / supersedes draft fix(selection): redact hostile model-comparison input failures #784

Test plan

• tests/test_model_comparison_input_error_boundary.py
• docs + fitstats fail-closed smoke

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📥 Commits

Reviewing files that changed from the base of the PR and between b4f39da and 0283f40.

📒 Files selected for processing (3)

• docs/changelog.d/784-model-comparison-input-error-boundary.md
• python/fast_mlsirm/model_comparison.py
• tests/test_model_comparison_input_error_boundary.py

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