GravityWeave - Agent Guidelines and Architecture

Architecture
- Language: Python 3.8+
- Minimal package: gravityweave
- Core modules: registry, plan_delta (CRDT), ledger, adapters, solver

Tech stack
- Standard library (hashlib, hmac, json, time)
- pytest for tests

Testing and CI
- Run tests and build with `bash test.sh`.
- `test.sh` builds the package (`python3 -m build`) and runs `pytest -q`.

Contribution rules
- Small incremental changes preferred.
- Follow existing patterns; keep public API names stable.
- Add unit tests for any new behavior.

Packaging
- pyproject.toml defines build metadata and is required for packaging.