feat(context): Interactive AST Tree Masking with per-symbol toggles

tests/test_file_item_model.py

@@ -7,6 +7,7 @@ def test_file_item_fields():
  assert item.path == "src/models.py"
  assert item.auto_aggregate is True
  assert item.force_full is False
+ assert item.ast_mask == {}
  assert item.injected_at is None
 
 def test_file_item_to_dict():
@@ -18,6 +19,7 @@ def test_file_item_to_dict():
   "force_full": True,
   "ast_signatures": False,
   "ast_definitions": False,
+  "ast_mask": {},
   "injected_at": None
  }
  assert item.to_dict() == expected
@@ -35,6 +37,7 @@ def test_file_item_from_dict():
  assert item.auto_aggregate is False
  assert item.force_full is True
  assert item.injected_at == 123.456
+ assert item.ast_mask == {}
 
 def test_file_item_from_dict_defaults():
  """Test that FileItem.from_dict handles missing fields."""
@@ -43,4 +46,5 @@ def test_file_item_from_dict_defaults():
  assert item.path == "test.py"
  assert item.auto_aggregate is True
  assert item.force_full is False
- assert item.injected_at is None
+ assert item.ast_mask == {}
+ assert item.injected_at is None