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### Summary
- Added a new method `get_channels_with_hash()` to the `Node` class.
- This method returns a list of dictionaries, each containing the channel index, role, name, and a hash value derived from the channel name and PSK.
- The hash is calculated using the existing `generate_hash` utility, ensuring consistency with other parts of the codebase.
- This utility makes it easier to programmatically access channel metadata, including a unique hash, for scripting, debugging, or integration purposes.
### Motivation
- The protobuf `Channel` objects do not include a hash value by default.
- This addition provides a Pythonic, easy-to-use way to access channel info and a unique hash for each channel, which can be useful for diagnostics, scripting, or UI display.
### Example Usage
```python
channels = node.get_channels_with_hash()
for ch in channels:
print(f"Index {ch['index']}: {ch['role']} name='{ch['name']}' hash={ch['hash']}")
```
### Impact
- No breaking changes; existing APIs and CLI output remain unchanged.
- The new method is additive and can be used where needed for enhanced channel introspection.