Add __repr__ to core API classes and consolidate object protocol tests

- Add __repr__ methods to Stream, Event, Context, Buffer, ObjectCode, Kernel
- Create test_object_protocols.py with comprehensive tests for:
  - Weak references (weakref.ref, WeakValueDict, WeakKeyDict, WeakSet)
  - Hash consistency, distinctness, and small value guards
  - Equality (reflexive, cross-type, same-type distinct objects)
  - Collection usage (dict, set, weak collections)
  - repr format validation with regex patterns
- Remove test_hashable.py, test_comparable.py, test_weakref.py (consolidated)

Author: Andy-Jost

cuda_core/cuda/core/_context.pyx

@@ -1,4 +1,4 @@
-# SPDX-FileCopyrightText: Copyright (c) 2024-2025 NVIDIA CORPORATION & AFFILIATES. All rights reserved.
+# SPDX-FileCopyrightText: Copyright (c) 2024-2026 NVIDIA CORPORATION & AFFILIATES. All rights reserved.
 #
 # SPDX-License-Identifier: Apache-2.0
 
@@ -48,6 +48,9 @@ cdef class Context:
     def __hash__(self) -> int:
         return hash(as_intptr(self._h_context))
 
+    def __repr__(self) -> str:
+        return f"Context(handle={as_intptr(self._h_context):#x}, device={self._device_id})"
+
 
 @dataclass
 class ContextOptions:

cuda_core/cuda/core/_event.pyx

@@ -1,4 +1,4 @@
-# SPDX-FileCopyrightText: Copyright (c) 2024-2025 NVIDIA CORPORATION & AFFILIATES. All rights reserved.
+# SPDX-FileCopyrightText: Copyright (c) 2024-2026 NVIDIA CORPORATION & AFFILIATES. All rights reserved.
 #
 # SPDX-License-Identifier: Apache-2.0
 
@@ -178,6 +178,9 @@ cdef class Event:
         cdef Event _other = <Event>other
         return as_intptr(self._h_event) == as_intptr(_other._h_event)
 
+    def __repr__(self) -> str:
+        return f"Event(handle={as_intptr(self._h_event):#x})"
+
     def get_ipc_descriptor(self) -> IPCEventDescriptor:
         """Export an event allocated for sharing between processes."""
         if self._ipc_descriptor is not None:

cuda_core/cuda/core/_memory/_buffer.pyx

@@ -1,4 +1,4 @@
-# SPDX-FileCopyrightText: Copyright (c) 2024-2025 NVIDIA CORPORATION & AFFILIATES. All rights reserved.
+# SPDX-FileCopyrightText: Copyright (c) 2024-2026 NVIDIA CORPORATION & AFFILIATES. All rights reserved.
 #
 # SPDX-License-Identifier: Apache-2.0
 
@@ -334,6 +334,9 @@ cdef class Buffer:
     def __hash__(self) -> int:
         return hash((as_intptr(self._h_ptr), self._size))
 
+    def __repr__(self) -> str:
+        return f"Buffer(ptr={as_intptr(self._h_ptr):#x}, size={self._size})"
+
     @property
     def is_device_accessible(self) -> bool:
         """Return True if this buffer can be accessed by the GPU, otherwise False."""

cuda_core/cuda/core/_module.py

@@ -1,4 +1,4 @@
-# SPDX-FileCopyrightText: Copyright (c) 2024-2025 NVIDIA CORPORATION & AFFILIATES. All rights reserved.
+# SPDX-FileCopyrightText: Copyright (c) 2024-2026 NVIDIA CORPORATION & AFFILIATES. All rights reserved.
 #
 # SPDX-License-Identifier: Apache-2.0
 
@@ -536,6 +536,9 @@ def __eq__(self, other) -> bool:
     def __hash__(self) -> int:
         return hash(int(self._handle))
 
+    def __repr__(self) -> str:
+        return f"Kernel(handle={int(self._handle):#x})"
+
 
 CodeTypeT = bytes | bytearray | str
 
@@ -775,3 +778,7 @@ def __eq__(self, other) -> bool:
     def __hash__(self) -> int:
         # Trigger lazy load to get the handle
         return hash(int(self.handle))
+
+    def __repr__(self) -> str:
+        # Trigger lazy load to get the handle
+        return f"ObjectCode(handle={int(self.handle):#x}, code_type='{self._code_type}')"

cuda_core/cuda/core/_stream.pyx

@@ -1,4 +1,4 @@
-# SPDX-FileCopyrightText: Copyright (c) 2024-2025 NVIDIA CORPORATION & AFFILIATES. All rights reserved.
+# SPDX-FileCopyrightText: Copyright (c) 2024-2026 NVIDIA CORPORATION & AFFILIATES. All rights reserved.
 #
 # SPDX-License-Identifier: Apache-2.0
 
@@ -221,6 +221,9 @@ cdef class Stream:
             return NotImplemented
         return as_intptr(self._h_stream) == as_intptr((<Stream>other)._h_stream)
 
+    def __repr__(self) -> str:
+        return f"Stream(handle={as_intptr(self._h_stream):#x})"
+
     @property
     def handle(self) -> cuda.bindings.driver.CUstream:
         """Return the underlying ``CUstream`` object.