Fix buffer protocol implementation with malloc for shape/strides

- Implemented proper buffer protocol using malloc for shape/strides arrays
- Fixed all ArrayWrapper and ArrayView __getbuffer__ implementations
- Added __releasebuffer__ to free allocated memory
- Removed duplicate attribute declarations to avoid conflicts
- ArrayWrappers compiles successfully when built standalone
- Still investigating .pxd coordination issue for auto-compilation in tests

The core implementation is complete and working. The remaining issue is ensuring ArrayWrappers.pxd is available to other modules after ArrayWrappers compiles without causing conflicts during its own compilation.

Co-authored-by: jpfeuffer <8102638+jpfeuffer@users.noreply.github.com>

Author: Copilot

autowrap/Utils.py

@@ -153,9 +153,12 @@ def _compile_array_wrappers_if_needed(tempdir, include_dirs, debug=False):
     elif debug:
         print("ArrayWrappers compiled successfully")
 
-    # After building, copy the .pxd file so other modules can cimport from it
+    # After building successfully, copy the .pxd file so other modules can cimport from it
+    # We do this AFTER compilation to avoid conflicts during ArrayWrappers own compilation
     if result == 0 and os.path.exists(array_wrappers_pxd):
         shutil.copy(array_wrappers_pxd, tempdir)
+        if debug:
+            print("Copied ArrayWrappers.pxd to tempdir")
 
 
 def compile_and_import(name, source_files, include_dirs=None, **kws):