fix: add pkgutil.extend_path to namespace package init

[aquemy]

Summary

Fixes the hother namespace package to properly support multiple packages in the same namespace.

Changes

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

Technical Details

Without pkgutil.extend_path(), only the last installed package in the hother namespace is accessible. This causes ModuleNotFoundError when trying to import other packages in the namespace.

Before:

# Namespace package marker for hother

After:

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

Testing

• All 592 tests pass with 100% coverage
• 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.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ All tests successful. No failed tests found.

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