refactor(ai_client): remove unused history management and bleed stats helpers

tests/test_history_management.py

@@ -112,22 +112,4 @@ def test_history_persistence_across_turns(tmp_path: Path) -> None:
  reloaded = project_manager.load_project(str(project_path))
  active_disc = reloaded["discussion"]["active"]
  h2 = reloaded["discussion"]["discussions"][active_disc]["history"]
- assert len(h2) >= 2
-
-def test_get_history_bleed_stats_basic() -> None:
- """Tests basic retrieval of history bleed statistics from the AI client."""
- ai_client.set_provider("gemini", "gemini-2.5-flash-lite")
- # Before any message, it might be 0 or based on an empty context
- stats = ai_client.get_history_bleed_stats()
- assert "provider" in stats
- assert stats["provider"] == "gemini"
- assert "current" in stats
- assert "limit" in stats, "Stats dictionary should contain 'limit'"
- 
- # Test with a different limit
- ai_client.set_model_params(0.0, 8192, 500)
- stats = ai_client.get_history_bleed_stats()
- assert "current" in stats, "Stats dictionary should contain 'current' token usage"
- assert 'limit' in stats, "Stats dictionary should contain 'limit'"
- assert stats['limit'] == 500
- assert isinstance(stats['current'], int) and stats['current'] >= 0
+ assert len(h2) >= 2