Fix scoped enum forward declaration bug

The bug was that scoped enums (enum class) were incorrectly generating
a `cdef class` forward declaration in the .pxd file, but their actual
implementation in the .pyx file was a regular Python `class` inheriting
from `_PyEnum`. This mismatch could cause issues in multi-module scenarios.

Fix: Only generate `cdef class` forward declarations for unscoped enums,
which are actually implemented as `cdef class` in the .pyx file. Scoped
enums don't need a forward declaration since they're regular Python
classes.

Also improved the test to use regex for more precise matching.

Author: claude

autowrap/CodeGenerator.py

@@ -444,16 +444,19 @@ def create_wrapper_for_enum(
         stub_code = Code()
         enum_pxd_code = Code()
 
-        enum_pxd_code.add(
-            """
-                   |
-                   |cdef class $name:
-                   |  pass
-                 """,
-            name=name,
-        )
-
         if not decl.scoped:
+            # Only generate cdef class forward declaration for unscoped enums,
+            # since they are implemented as cdef classes in the .pyx file.
+            # Scoped enums are implemented as regular Python classes (Enum subclasses)
+            # and should NOT have a cdef class forward declaration.
+            enum_pxd_code.add(
+                """
+                       |
+                       |cdef class $name:
+                       |  pass
+                     """,
+                name=name,
+            )
             code.add(
                 """
                        |

tests/test_code_generator.py

@@ -572,8 +572,10 @@ def test_enum_class_forward_declaration(tmpdir):
         # Find if Status is defined as "class Status(_PyEnum)" in pyx
         has_python_enum_class = "class Status(_PyEnum)" in enum_module_pyx
 
-        # Find if Status has "cdef class Status" forward declaration in pxd
-        has_cdef_class_forward_decl = "cdef class Status" in enum_module_pxd
+        # Find if Status has "cdef class Status:" forward declaration in pxd
+        # Use regex to match exact class name (avoid matching "cdef class StatusHandler")
+        import re
+        has_cdef_class_forward_decl = re.search(r"cdef class Status\s*:", enum_module_pxd) is not None
 
         # This is the bug: scoped enums should NOT have cdef class forward declarations
         # because they are implemented as regular Python classes (Enum subclasses)