GridVerse MVP Scaffold

Overview
- Lightweight, extensible core for cross-domain optimization with a canonical registry and adapter marketplace skeleton.
- Core primitives are represented as in-memory contracts (LocalProblem as Objects, SharedVariables as Morphisms, Adapters as Functors).
- Provides a minimal ADMM-like solver and delta-sync stub for offline/partitions handling.

Tech Stack (initial)
- Python 3.x, numpy for numeric helpers, pytest for tests.
- In-repo registry and adapters with TLS transport stubs (not implemented in this minimal scaffold).

How to use
- Run tests with: bash test.sh
- Extend with real adapters and a full TLS transport layer in subsequent iterations.

Testing Rules
- Tests run via pytest. Packaging checks run via python -m build.
- Keep changes small and backwards-compatible by default.

Contribution Guide
- Use the gridverse package namespace (gridverse.*).
- Add new adapters under gridverse/adapter_marketplace/ with a consistent interface.
- Update tests to cover new contracts and adapters.