CK: Remove 41 commented-out dead code blocks (~200 lines) (#6302)

Depends on #6300 

## Summary

Remove 41 commented-out code blocks across 33 files in Composable
Kernel, totaling ~200 lines.

Identified using an automated dead code scanning skill (`ck-dead-code`)
with a calibrated two-stage pipeline:
1. **Pre-filter**: Keyword-based scan found 1,338 `//`-commented blocks.
Calibrated heuristics (trained on 50-sample expert classification)
reduced to 89 high-confidence candidates — 93% noise reduction.
2. **Expert triage**: LLM expert classified each block in context as
CODE_REMOVE, CODE_KEEP, or NOT_CODE.

| Classification | Count |
|---------------|-------|
| Removed (this PR) | 41 |
| Kept (debug helpers, alt configs, reference impls) | 32 |
| Not code (false positives) | 16 |

Removed blocks include: superseded implementations, old test data,
abandoned stubs, unreachable code, and buggy dead code.

profiler/src/profile_softmax.cpp

@@ -278,11 +278,4 @@ int profile_softmax(int argc, char* argv[])
     return 0;
 }
 
-// hijack main() for quick debugging
-// int main(int argc, char* argv[])
-// {
-//     profile_normalization(argc, argv);
-//     return 0;
-// }
-
 REGISTER_PROFILER_OPERATION("softmax", "Softmax", profile_softmax);