feat(types): Complete strict static analysis and typing track

tests/test_mma_agent_focus_phase1.py

@@ -2,11 +2,8 @@
 Tests for mma_agent_focus_ux_20260302 — Phase 1: Tier Tagging at Emission.
 These tests are written RED-first: they fail before implementation.
 """
-from typing import Generator
 import pytest
-from unittest.mock import patch
 import ai_client
-from gui_2 import App
 
 
 @pytest.fixture(autouse=True)