feat(sdm): inject structural dependency mapping tags across codebase

Adds [C: caller] tags to functions/methods and [M: mutation] / [U: usage] tags to class variables based on cross-module call analysis.

tests/test_system_prompt_sim.py

@@ -7,13 +7,14 @@ import os
 def test_system_prompt_sim(live_gui):
  """
  
-  Simulation test for system prompt settings.
-  1. Wait for server.
-  2. Verify initial state.
-  3. Modify settings via API.
-  4. Verify updates.
-  5. Use 'Reset to Default' button via API.
-  6. Verify restoration to default text.
+  
+   Simulation test for system prompt settings.
+   1. Wait for server.
+   2. Verify initial state.
+   3. Modify settings via API.
+   4. Verify updates.
+   5. Use 'Reset to Default' button via API.
+   6. Verify restoration to default text.
  """
  _, gui_script = live_gui
  client = ApiHookClient()
@@ -68,4 +69,4 @@ def test_system_prompt_sim(live_gui):
  
  # Close it
  client.set_value('show_base_prompt_diff_modal', False)
- assert client.get_value('show_base_prompt_diff_modal') is False
+ assert client.get_value('show_base_prompt_diff_modal') is False