Adding a Studio Policy

Policies live in library/src/physicalai/policies/<name>/. Each family is a Lightning-facing Policy wrapping a torch.nn.Module Model, split across three files. Base classes are in policies/base/ (Policy in policy.py, Model in model.py); shared Config / FromConfig types come from Runtime (physicalai.config) — see docs/how-to/config/use-from-config.md and docs/explanation/configuration.md in the physicalai repo.

Workflow