Applied 236 return type annotations to functions with no return values
across 100+ files (core modules, tests, scripts, simulations).
Added Phase 4 to python_style_refactor track for remaining 597 items
(untyped params, vars, and functions with return values).
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
Integrates the ai_client.events emitter into the gui_2.py App class. Adds a new test file to verify that the App subscribes to API lifecycle events upon initialization. This is the first step in aligning gui_2.py with the project's event-driven architecture.
