Fixes equality and hash to make these consistent. Both include context handle.

Author: rparolin

cuda_core/cuda/core/experimental/_stream.pyx

@@ -198,13 +198,25 @@ cdef class Stream:
         return (0, <uintptr_t>(self._handle))
 
     def __hash__(self) -> int:
+        # Ensure context is initialized for hash consistency
+        if self._ctx_handle == CU_CONTEXT_INVALID:
+            self._get_context()
         return hash((type(self), <uintptr_t>(self._ctx_handle), <uintptr_t>(self._handle)))
 
     def __eq__(self, other) -> bool:
         if not isinstance(other, Stream):
             return NotImplemented
         cdef Stream _other = <Stream>other
-        return <uintptr_t>(self._handle) == <uintptr_t>((_other)._handle)
+        # Fast path: compare handles first
+        if <uintptr_t>(self._handle) != <uintptr_t>((_other)._handle):
+            return False
+        # Ensure contexts are initialized for both streams
+        if self._ctx_handle == CU_CONTEXT_INVALID:
+            self._get_context()
+        if _other._ctx_handle == CU_CONTEXT_INVALID:
+            _other._get_context()
+        # Compare contexts as well
+        return <uintptr_t>(self._ctx_handle) == <uintptr_t>((_other)._ctx_handle)
 
     @property
     def handle(self) -> cuda.bindings.driver.CUstream: