feat: refactored and tweaked model descriptions / schema to use fewer tokens at launch (average reduction per field description: 60-80%) without sacrificing tool effectiveness

Disabled secondary tools by default (for new installations), updated README.md with instructions on how to enable these in .env
run-server.sh now displays disabled / enabled tools (when DISABLED_TOOLS is set)

tests/test_tracer.py

@@ -23,10 +23,10 @@ class TestTracerTool:
     def test_get_description(self, tracer_tool):
         """Test that the tool returns a comprehensive description"""
         description = tracer_tool.get_description()
-        assert "STEP-BY-STEP CODE TRACING WORKFLOW" in description
+        assert "code tracing" in description
         assert "precision" in description
         assert "dependencies" in description
-        assert "guided investigation" in description
+        assert "systematic" in description
 
     def test_get_input_schema(self, tracer_tool):
         """Test that the input schema includes required fields"""