Fix all typecheck errors in source code

- Fix partially unknown types from empty set() literals with annotations
- Use getattr-based indexing for runtime probes on object-typed instances
- Fix val_type annotation for hidden type discovery
- Use raw_type string check instead of isinstance for classmethod detection
- Access classmethod.__func__ via getattr to avoid partial unknown types
- Fix struct base type narrowing in collect_all_type_strings

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

generate_stubs.py

@@ -84,8 +84,9 @@ def collect_all_type_strings(module_data: ModuleData) -> list[str]:
     for var in module_data["variables"]:
         all_types.append(map_type(var["type"]))
     for struct in module_data.get("structs", []):
-        if struct.get("base"):
-            all_types.append(struct["base"])
+        base = struct.get("base")
+        if base:
+            all_types.append(base)
         for prop in struct["properties"]:
             all_types.append(prop["type"])
         for method in struct["methods"]:
@@ -538,13 +539,11 @@ def collect_inherited_info(
         if base in by_name:
             base_methods = {m["name"] for m in by_name[base]["methods"]}
             base_ro_props = {
-                p["name"]
-                for p in by_name[base]["properties"]
-                if p["is_readonly"]
+                p["name"] for p in by_name[base]["properties"] if p["is_readonly"]
             }
         else:
-            base_methods = set()
-            base_ro_props = set()
+            base_methods: set[str] = set()
+            base_ro_props: set[str] = set()
         parent = get_inherited(base)
         cache[name] = _InheritedInfo(
             base_methods | parent.methods,
@@ -755,8 +754,7 @@ def generate_module_stub(
 
     # Add TypeVar if any struct uses Generic[_T]
     if any(
-        "Generic[_T]" in (s.get("base") or "")
-        for s in module_data.get("structs", [])
+        "Generic[_T]" in (s.get("base") or "") for s in module_data.get("structs", [])
     ):
         parts.append('_T = TypeVar("_T")')
         parts.append("")