Fix typecheck errors across all Blender versions

- Strip single backtick RST markup from type annotations (` int ` -> int)
- Convert "string in ['X', 'Y']" docstring patterns to Literal types
- Map undefined ContextTempOverride type to object
- Add Callable import to bpy.types stub generator
- Fix Callable[[object, ...], X] -> Callable[..., X] for varargs
- Fix Literal[...] = False incompatible defaults to use ...
- Include classmethod-wrapped C builtins in RNA type C-method scan

Remaining pre-existing errors:
- 4.0-4.3: Sequence name clash with bpy.types.Sequence
- 4.0: Node.type structural RNA conflict
- 5.1: BMElemSeq/BMLayerCollection not declared as generic

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

generate_stubs.py

@@ -176,10 +176,14 @@ def format_param(param: ParamData, force_type: bool = False) -> str:
         parts.append(f": {type_str}")
 
     if param["default"] is not None:
+        default = param["default"]
+        # Fix incompatible defaults: Literal types can't have bool defaults
+        if type_str and "Literal[" in type_str and default in ("False", "True"):
+            default = "..."
         if type_str:
-            parts.append(f" = {param['default']}")
+            parts.append(f" = {default}")
         else:
-            parts.append(f"={param['default']}")
+            parts.append(f"={default}")
 
     return "".join(parts)
 
@@ -552,6 +556,8 @@ def generate_types_stub(
         typing_imports.append("Literal")
 
     abc_imports = ["Iterator"]
+    if "Callable" in all_type_strs:
+        abc_imports.append("Callable")
     if "MutableSequence[" in all_type_strs:
         abc_imports.append("MutableSequence")
     # Only import bare Sequence if used without collections.abc. prefix