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registry: SUPPORTED_SYSTEMS = only 3 trained systems

registry: remove tier3 from SUPPORTED_SYSTEMS; mark as TODO

cleanup: strip verbose comments from physix/models.py

cleanup: strip verbose comments from physix/server/app.py

cleanup: strip verbose comments from physix/server/providers.py

cleanup: strip verbose comments from physix/training/dataset.py

cleanup: strip verbose comments from physix/training/sft.py

cleanup: strip verbose comments from physix/training/prompt.py

cleanup: strip verbose comments from physix/training/reward_fns.py

cleanup: strip verbose comments from physix/training/loop.py

Add get_metadata() with proper description; verify reset/step/state work

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