1. ix_bridge.py: RuntimeError instead of silent PyTorch fallback
If JIT compile fails, crash immediately with diagnostic message.
0 score with no error log is worse than a visible crash.
2. qwen3_5.py: explicit WARNING log on import failure (not silent)
Shows exact error so we can diagnose from docker log.
3. probe_ixformer_symbols.py: definitive test for real machine
- Finds all ixformer .so files
- nm/objdump for topk_softmax C++ symbol
- Checks Python bindings
- Attempts JIT compile + link (the real test)
- Prints PASS/FAIL with next-step instructions
Run on real machine: python3 probe_ixformer_symbols.py