chore: remove remaining dead-mode references from executor, jobs, compose, Dockerfile
After removing the object pipeline, several dead 'mode' artifacts remained: - executor.py: unpack `config` from job even though it was no longer read - jobs.py: set `"mode": "face"` in both configure paths (key never consumed) - compose.yml: TRAINING_MODE=face env, OBJECT_CLASS comment, HF_HOME, stale MAX_AUTO_IMAGES default note - Dockerfile: "and object classification" label, /models/huggingface mkdir, HF_HOME ENV
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