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/app_controller.py

@@ -2,8 +2,10 @@ import threading
 import time
 import copy
 import sys
+import traceback
 import os
 import re
+import inspect
 from typing import Any, List, Dict, Optional, Callable
 from pathlib import Path
 from src import workspace_manager
@@ -865,7 +867,6 @@ class AppController:
      elif item == "btn_mma_load_track":
       self._cb_load_track(str(user_data or ""))
      elif item in self._clickable_actions:
-      import inspect
       func = self._clickable_actions[item]
       try:
        sig = inspect.signature(func)
@@ -974,7 +975,6 @@ class AppController:
       self.mma_streams[stream_id] = ""
      self.mma_streams[stream_id] += f"[BEAD UPDATE] {bead_id} -> status: {status}\n"
    except Exception as e:
-    import traceback
     sys.stderr.write(f"[DEBUG] Error executing GUI task: {e}\n{traceback.format_exc()}\n")
     sys.stderr.flush()
     print(f"Error executing GUI task: {e}")
@@ -1642,7 +1642,6 @@ class AppController:
    sys.stderr.flush()
    self.event_queue.put("response", {"text": e.ui_message(), "status": "error", "role": "Vendor API"})
   except Exception as e:
-   import traceback
    sys.stderr.write(f"[DEBUG] _handle_request_event ERROR: {e}\n{traceback.format_exc()}\n")
    sys.stderr.flush()
    self.event_queue.put("response", {"text": f"ERROR: {e}", "status": "error", "role": "System"})
@@ -2642,7 +2641,6 @@ class AppController:
     sys.stderr.write("[DEBUG] Enqueued user_request event\n")
     sys.stderr.flush()
    except Exception as e:
-    import traceback
     sys.stderr.write(f"[DEBUG] _do_generate ERROR: {e}\n{traceback.format_exc()}\n")
     sys.stderr.flush()
     self._set_status(f"generate error: {e}")