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/diff_viewer.py

@@ -36,6 +36,9 @@ def parse_diff_header(line: str) -> tuple[Optional[str], Optional[str], Optional
   return None, None, None
 
 def parse_hunk_header(line: str) -> Optional[tuple[int, int, int, int]]:
+  """
+  [C: tests/test_diff_viewer.py:test_parse_hunk_header]
+  """
   if not line.startswith("@@"):
     return None
   
@@ -57,6 +60,9 @@ def parse_hunk_header(line: str) -> Optional[tuple[int, int, int, int]]:
   return (old_start, old_count, new_start, new_count)
 
 def parse_diff(diff_text: str) -> List[DiffFile]:
+  """
+  [C: src/gui_2.py:App.request_patch_from_tier4, tests/test_diff_viewer.py:test_diff_line_classification, tests/test_diff_viewer.py:test_parse_diff_empty, tests/test_diff_viewer.py:test_parse_diff_none, tests/test_diff_viewer.py:test_parse_diff_with_context, tests/test_diff_viewer.py:test_parse_multiple_files, tests/test_diff_viewer.py:test_parse_simple_diff, tests/test_diff_viewer.py:test_render_diff_text_immediate]
+  """
   if not diff_text or not diff_text.strip():
     return []
   
@@ -132,6 +138,9 @@ def format_diff_for_display(diff_files: List[DiffFile]) -> str:
   return "\n".join(output)
 
 def get_line_color(line: str) -> Optional[str]:
+  """
+  [C: tests/test_diff_viewer.py:test_get_line_color]
+  """
   if line.startswith("+"):
     return "green"
   elif line.startswith("-"):
@@ -141,6 +150,9 @@ def get_line_color(line: str) -> Optional[str]:
   return None
 
 def render_diff_text_immediate(diff_files: List[DiffFile]) -> List[tuple[str, Optional[str]]]:
+  """
+  [C: tests/test_diff_viewer.py:test_render_diff_text_immediate]
+  """
   output: List[tuple[str, Optional[str]]] = []
   for df in diff_files:
     output.append((f"File: {df.old_path}", "white"))
@@ -152,6 +164,9 @@ def render_diff_text_immediate(diff_files: List[DiffFile]) -> List[tuple[str, Op
   return output
 
 def create_backup(file_path: str) -> Optional[str]:
+  """
+  [C: tests/test_diff_viewer.py:test_create_backup, tests/test_diff_viewer.py:test_create_backup_nonexistent]
+  """
   path = Path(file_path)
   if not path.exists():
     return None
@@ -160,6 +175,9 @@ def create_backup(file_path: str) -> Optional[str]:
   return str(backup_path)
 
 def apply_patch_to_file(patch_text: str, base_dir: str = ".") -> Tuple[bool, str]:
+  """
+  [C: src/gui_2.py:App._apply_pending_patch, tests/test_diff_viewer.py:test_apply_patch_simple, tests/test_diff_viewer.py:test_apply_patch_with_context]
+  """
   import difflib
   
   diff_files = parse_diff(patch_text)
@@ -207,6 +225,9 @@ def apply_patch_to_file(patch_text: str, base_dir: str = ".") -> Tuple[bool, str
   return True, "\n".join(results)
 
 def restore_from_backup(file_path: str) -> bool:
+  """
+  [C: tests/test_diff_viewer.py:test_restore_from_backup]
+  """
   backup_path = Path(str(file_path) + ".backup")
   if not backup_path.exists():
     return False
@@ -215,6 +236,9 @@ def restore_from_backup(file_path: str) -> bool:
   return True
 
 def cleanup_backup(file_path: str) -> None:
+  """
+  [C: tests/test_diff_viewer.py:test_cleanup_backup]
+  """
   backup_path = Path(str(file_path) + ".backup")
   if backup_path.exists():
-    backup_path.unlink()
+    backup_path.unlink()