perf(amd): port MI355X Qwen3.5 FP8 disagg sweep to srt-slurm

[cquil11]

Summary

• replace the active MI355X Qwen3.5 FP8 legacy AMD disaggregated launcher with the existing native srt-slurm SGLang Router + MoRI recipe
• preserve the production 1P1D TP8 topology and complete c8/c16/c32/c64/c128 8k1k search space
• run every point inside one eight-hour Slurm allocation through the repository's unchanged benchmark_serving.py
• remove the model-specific legacy wrapper that only translated matrix variables into amd_utils/submit.sh
• consolidate the temporary -srt-disagg validation key back into the original production config key

Validation

• srt-slurm dry-run passes against feat(runtime): add AMD accelerator support srt-slurm#1 at c609754b5622f96d5c12a93149e245308d4f1e9b
• generated matrix contains exactly one topology job; the recipe owns all five concurrency points
• 231 matrix-generation and validation tests pass
• changed YAML parses and git diff --check passes

Stack

Based on #2542. This remains draft until the exact-head MI355X full recipe sweep completes.

[github-actions]

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