fix: create namespace package init with pkgutil.extend_path

[aquemy]

Summary

Creates the missing hother/__init__.py file to properly support Python namespace packages.

Changes

• Create src/hother/__init__.py with pkgutil.extend_path() call
• This enables packages like hother.streamblocks, hother.cancelable, and hother.reactive_agent to coexist

Technical Details

The hother/__init__.py file was completely missing from this repository. Without it and the pkgutil.extend_path() call, only the last installed package in the hother namespace is accessible, causing ModuleNotFoundError when trying to import other packages in the namespace.

New file:

# Namespace package
__path__ = __import__("pkgutil").extend_path(__path__, __name__)

Testing

• All pre-commit hooks pass
• Local testing confirms namespace packages work correctly after this fix

Impact

This is a critical fix for the hother namespace package ecosystem. It enables proper installation of multiple hother-* packages.

Related

• fix: add pkgutil.extend_path to namespace package init cancelable#11 (same fix for cancelable)