Summary

This PR fixes the packaging configuration and unit test suite for the Python plugin to resolve import errors and compatibility issues under modern Python versions (e.g. Python 3.14+). It also incorporates the latest changes from upstream/main to resolve conflicts.

Changes Made

1. Packaging Fixes (pyproject.toml):

   • Fixed the setuptools package finder to look for and include the contract package instead of the non-existent plugin package.
   • Listed main module explicitly in py-modules.
   • Corrected the canopy-plugin script entrypoint mapping to main:main.
   • Relaxed the protobuf dependency constraint to protobuf>=4.21.0 (removed the <5.0.0 upper bound) to allow installing versions compatible with Python 3.14's C-API metaclass changes.

2. Unit Test Improvements:

   • tests/test_config.py: Rewrote configuration tests to align with the actual Config dataclass and helper functions in the codebase.
   • tests/test_contract.py: Overwrote the placeholder tests with a self-contained, stateless/mock-based unit test suite for the core Contract and MessageSend transaction. Removed dependencies on unimplemented tutorial-specific messages (MessageFaucet, MessageReward).
   • Fixed database read key matching logic in mocks (keys generated via join_len_prefix have length prefixes, so actual type markers start at the second byte).

3. Upstream Synchronization:

   • Merged the latest main branch from canopy-network/canopy (resolving conflicts in the test files).

Verification

Created a clean virtual environment and ran unit tests:

python -m venv venv
.\venv\Scripts\python -m pip install -e .[test]
.\venv\Scripts\python -m pip install --upgrade protobuf
.\venv\Scripts\pytest