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/multi_agent_conductor.py

@@ -218,7 +218,6 @@ class ConductorEngine:
             md_content: The full markdown context (history + files) for AI workers.
             max_ticks: Optional limit on number of iterations (for testing).
         """
-  import sys
   tick_count = 0
   while True:
    if self._pause_event.is_set():
@@ -282,10 +281,7 @@ class ConductorEngine:
       else:
        # Check if ticket has a persona with preferred_models
        if ticket.persona_id:
-        # Try to load preferred_models from persona
         try:
-         from src.personas import PersonaManager
-         from src import paths
          pm = PersonaManager(Path(paths.get_project_personas_path(Path.cwd())) if paths.get_project_personas_path(Path.cwd()).exists() else None)
          personas = pm.load_all()
          if ticket.persona_id in personas: