* fix: stabilize ROCm MIGraphX inference
Serialize MIGraphX session runs so lazy compiles cannot overlap within a worker.
Use a fixed face-recognition batch size for MIGraphX to avoid compiling a new program for each detected face count.
* fix(ml): increase ROCm worker timeout
* fix(ml): narrow MIGraphX compile locking
* docs: format environment variables table
* docs: apply prettier to environment variables table
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