Review all existing tests

[mawad-amd]

Review all existing tests

We like tests but we like tests too much. We have 2,454 tests (see #348 for reference).

Your job: Review the entire test suite and tell us what's redundant, duplicate, unnecessarily time-consuming, or just plain wasteful.

What we want:

A response with:

• Summary of findings (what's bloated, what's redundant, what's slow)
• Specific examples of problematic tests with reasoning
• A plan for reducing test count while maintaining coverage
• Estimated time/cost savings

No code changes. Just analysis and recommendations.

Tools:

• Check .github/workflows/ to understand the CI testing structure (60 test matrix jobs across 5 directories, 4 rank configs, 3 install methods)
• Use gh CLI to check CI run times and patterns from recent PRs (start with Fix DMA-BUF Export/Import with PyTorch Caching Allocator Offsets #348)
• Look at test execution logs for timing data
• Dig through the test code in tests/

Give us specific recommendations with reasoning. No handwaving - we need actionable insights.