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>

introspect.py

@@ -322,12 +322,24 @@ def clean_type_str(type_str: str) -> str:
     type_str = re.sub(r":class:`([^`]+)`", r"\1", type_str)
     # Remove double backtick RST markup
     type_str = re.sub(r"``([^`]+)``", r"\1", type_str)
+    # Remove single backtick markup (` int ` → int)
+    type_str = re.sub(r"`\s*([^`]+?)\s*`", r"\1", type_str)
     # Strip leaked RST directives from type strings
     type_str = re.sub(r"\.?\s*(?:r?type|returns?):.*", "", type_str)
     # Strip stray RST role colons but not :param, :arg, :type directives
     type_str = re.sub(r":(?!param|arg|type|return)(\w)", r"\1", type_str)
     type_str = type_str.rstrip(":.,")
 
+    # Convert "string in ['X', 'Y', ...]" to Literal["X", "Y", ...]
+    str_in_match = re.match(
+        r"str(?:ing)?\s+in\s+\[([^\]]+)\]", type_str, re.IGNORECASE
+    )
+    if str_in_match:
+        values = re.findall(r"'([^']+)'", str_in_match.group(1))
+        if values:
+            quoted = ", ".join(f'"{v}"' for v in values)
+            return f"Literal[{quoted}]"
+
     # Convert tuple(X, Y) to tuple[X, Y] (docstrings sometimes use parens)
     type_str = re.sub(r"\btuple\(([^)]+)\)", r"tuple[\1]", type_str)
 
@@ -480,6 +492,10 @@ def clean_type_str(type_str: str) -> str:
     # Bare generics without params -> add default params.
     # Use \b on both sides to avoid matching inside longer names (e.g. SequenceEntry).
     type_str = re.sub(r"\bCallable\b(?!\[)", "Callable[..., object]", type_str)
+    # Fix Callable[[..., ...], X] or Callable[[object, ...], X] -> Callable[..., X]
+    type_str = re.sub(
+        r"Callable\[\[[^\]]*\.\.\.[^\]]*\]", "Callable[...", type_str
+    )
     type_str = re.sub(r"\bdict\b(?!\[)", "dict[str, object]", type_str)
     type_str = re.sub(r"\blist\b(?!\[)", "list[object]", type_str)
     type_str = re.sub(r"\btuple\b(?!\[)", "tuple[object, ...]", type_str)
@@ -682,6 +698,13 @@ def clean_type_str(type_str: str) -> str:
     ):
         type_str = "object"
 
+    # Map types that exist in docstrings but not in the Blender Python API
+    _UNDEFINED_TYPE_MAP = {
+        "ContextTempOverride": "object",
+    }
+    if type_str in _UNDEFINED_TYPE_MAP:
+        return _UNDEFINED_TYPE_MAP[type_str]
+
     # Final balance check — catch any remaining malformed types
     if type_str.count("[") != type_str.count("]") or type_str.count(
         "("