test: validate AMD power exporters on MI300X, MI325X, and MI355X

[cquil11]

Tests srt-slurm #31 at 4f95eee1b9f50fc0dadbc7163f93800680bca0a7 as a patch on the current InferenceX runtime.

One Qwen3.5 FP8 fixed-sequence point per cluster: TP8, concurrency 4, 8k1k. MI355X uses a test-only TP8 override; these results are not for performance publication.

Runs the official AMD exporter on port 19500 to avoid existing cluster services, requires native power telemetry, and writes the single-node measurement window using the existing InferenceX helper. Python setup uses runner scratch because MI325X's home-directory mount is unavailable.

Validation

Cluster	Run	Result
MI300X	Single-node	Passed; 40/40 requests, 8-GPU power validation
MI325X	Single-node	Passed; 40/40 requests, 8-GPU power validation
MI355X	Single-node	Passed; 40/40 requests, 8-GPU power validation
MI355X	Disaggregated 1P1D	Failed telemetry readiness: exporter omitted GPU power readings

The disaggregated smoke uses the existing Qwen3.5 FP8 SGLang/MoRI recipe, with test-only TP8 prefill and one concurrency, to validate all 16 GPUs across two nodes. Required native telemetry is enabled.

Do not merge this smoke-test branch.

[github-actions]

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[functionstackx]

Sorry, over the weekend, there was 2 major refactors to clean up the technical debt accumalated over the past 11 months of moving at the speed of light. We don't see any major refactors in the forthseeable future besides cleaning up AMD multinode AgentX pile of bash. As much, due to the refactors, u would need to ask your agent to rebase from remote main@latest. Thank you in advance for ur understanding

[adibarra]

Heads-up: #3576 (merged) replaced the bash launchers with a Python launcher, so this PR will conflict when you merge main, and the sweep won't start until that's resolved. Please merge main and move your launcher changes over to configs/runners.yaml / infx/launch/. Apologies for the churn, and thanks for your understanding as we wrap up the repo-wide refactoring push.