perf(entropy): Fix nested imports in hot paths

Hoisted imports from inside frequently-called functions to module level:

app_controller.py:
- Added traceback and inspect at module level
- Removed 3 nested traceback imports from exception handlers

gui_2.py:
- Added traceback at module level
- Removed nested traceback import from _gui_func exception handler
- Kept uvicorn lazy-loaded (only for --headless mode)

multi_agent_conductor.py:
- Removed unused 'import sys' from run()
- Removed redundant nested imports (already at module level)

Also adds audit scripts and entropy findings documentation.

src/gui_2.py

@@ -35,6 +35,7 @@ from src import thinking_parser
 import re
 import difflib
 import subprocess
+import traceback
 if sys.platform == "win32":
  import win32gui
  import win32con
@@ -1319,7 +1320,6 @@ class App:
     imgui.end_popup()
   except Exception as e:
    print(f"ERROR in _gui_func: {e}")
-   import traceback
    traceback.print_exc()
   
   if pushed_prior_tint: