Fix all typecheck errors across all 8 Blender versions (4.0-5.1)

- Fix Sequence name clash in bpy.types by never importing it directly
- Qualify all bare Sequence[ to collections.abc.Sequence[ in bpy.types
- Force writable properties to readonly when overriding parent @property
- Auto-detect classes used as generics and add Generic[_T] base
- Include struct bases in type string collection for import detection
- Strip RST backslash-space before generic brackets in docstrings
- Convert "string in ['X', 'Y']" docstring pattern to Literal types
- Strip single backtick RST markup from type annotations
- Fix Callable[[object, ...], X] -> Callable[..., X]
- Add Callable import to bpy.types generator
- Map ContextTempOverride to object, handle BMVertSkin removal in 5.1
- Fix Literal[...] = False incompatible defaults
- Update test for collect_inherited_info rename

Result: 0 errors on all versions (4.0, 4.1, 4.2, 4.3, 4.4, 4.5, 5.0, 5.1)

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

tests/test_generate_stubs.py

@@ -5,7 +5,7 @@ import unittest
 from generate_stubs import (
     ParamOverrides,
     apply_overrides,
-    collect_all_methods,
+    collect_inherited_info,
     generate_function_stub,
     generate_method_stub,
     generate_property_stub,
@@ -674,10 +674,10 @@ class TestCollectAllMethods(unittest.TestCase):
                 "methods": [method],
             },
         ]
-        result = collect_all_methods(structs)
-        self.assertEqual(result["Node"], set())
-        self.assertIn("is_registered_node_type", result["TextureNode"])
-        self.assertIn("is_registered_node_type", result["TextureNodeValToRGB"])
+        result = collect_inherited_info(structs)
+        self.assertEqual(result["Node"].methods, set())
+        self.assertIn("is_registered_node_type", result["TextureNode"].methods)
+        self.assertIn("is_registered_node_type", result["TextureNodeValToRGB"].methods)
 
 
 class TestGenerateTypesStub(unittest.TestCase):