refactor(sdm): Global pass with refined 'External Only' SDM tags. Pruned redundant internal references and fixed indentation logic in injector. Verified full project compilation.

src/bg_shader.py

@@ -7,11 +7,17 @@ from imgui_bundle import imgui, nanovg as nvg, hello_imgui
 
 class BackgroundShader:
  def __init__(self):
+  """
+  [C: src/mcp_client.py:_DDGParser.__init__, src/mcp_client.py:_TextExtractor.__init__]
+  """
   self.enabled = False
   self.start_time = time.time()
   self.ctx: Optional[nvg.Context] = None
 
  def render(self, width: float, height: float):
+  """
+  [C: src/gui_2.py:App._gui_func, src/gui_2.py:App._render_discussion_panel, src/gui_2.py:App._render_heavy_text, src/gui_2.py:App._render_markdown_test, src/gui_2.py:App._render_response_panel, src/gui_2.py:App._render_snapshot_tab, src/markdown_helper.py:MarkdownRenderer._render_code_block, src/markdown_helper.py:MarkdownRenderer.render, src/markdown_helper.py:render, tests/test_theme_nerv_alert.py:test_alert_pulsing_render_active, tests/test_theme_nerv_alert.py:test_alert_pulsing_render_inactive, tests/test_theme_nerv_fx.py:TestThemeNervFx.test_alert_pulsing_render, tests/test_theme_nerv_fx.py:TestThemeNervFx.test_crt_filter_disabled, tests/test_theme_nerv_fx.py:TestThemeNervFx.test_crt_filter_render]
+  """
   if not self.enabled or width <= 0 or height <= 0:
    return
 
@@ -59,8 +65,10 @@ class BackgroundShader:
 _bg: Optional[BackgroundShader] = None
 
 def get_bg():
+ """
+ [C: src/gui_2.py:App._gui_func, src/gui_2.py:App._render_theme_panel]
+ """
  global _bg
  if _bg is None:
   _bg = BackgroundShader()
  return _bg
-