Remove nested duplicate: scaffold/scaffold/rivet_serve.py

Move scaffold/scaffold/rivet_serve.py -> scaffold/rivet_serve.py

Remove nested duplicate: scaffold/scaffold/discipline_gate.py

Move scaffold/scaffold/discipline_gate.py -> scaffold/discipline_gate.py

Remove nested duplicate: scaffold/scaffold/context_loader.py

Move scaffold/scaffold/context_loader.py -> scaffold/context_loader.py

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