Remove primary context reset tests to avoid test contamination

Primary context resets corrupt CuPy's internal state, causing cascading
failures in unrelated tests. Keep only non-primary context destroy tests
which isolate the library/context lifetime issue without side effects.

Co-authored-by: Cursor <cursoragent@cursor.com>

Author: Andy-Jost

cuda_core/tests/test_library_context_lifetime.py

@@ -5,9 +5,8 @@
 
 These tests exercise scenarios where a CUDA library (CUlibrary) or kernel
 (CUkernel) outlives the context in which it was created. This can happen
-when:
-  - The primary context is reset (e.g. numba-cuda's test teardown)
-  - A non-primary context is explicitly destroyed
+when a non-primary context is explicitly destroyed while libraries or
+kernels loaded within it are still alive.
 
 Currently, LibraryBox in resource_handles.cpp does NOT store a
 ContextHandle, so nothing prevents the context from being destroyed
@@ -20,7 +19,7 @@
 
 import pytest
 from cuda.bindings import driver
-from cuda.core import Device, Program
+from cuda.core import Program
 from cuda.core._utils.cuda_utils import handle_return
 
 KERNEL_SOURCE = 'extern "C" __global__ void test_kernel() {}'
@@ -50,50 +49,6 @@ def _restore_primary_context():
     handle_return(driver.cuCtxSetCurrent(ctx))
 
 
-class TestPrimaryContextReset:
-    """Library/kernel destroyed after primary context reset."""
-
-    def test_objectcode_outlives_primary_context_reset(self):
-        dev = Device(0)
-        dev.set_current()
-
-        obj, kernel = _compile_and_get_kernel()
-        del kernel
-
-        handle_return(driver.cuDevicePrimaryCtxReset(0))
-
-        del obj
-        gc.collect()
-
-    def test_kernel_outlives_primary_context_reset(self):
-        dev = Device(0)
-        dev.set_current()
-
-        obj, kernel = _compile_and_get_kernel()
-        del obj
-
-        handle_return(driver.cuDevicePrimaryCtxReset(0))
-
-        del kernel
-        gc.collect()
-
-    def test_objectcode_outlives_primary_context_reset_and_reretain(self):
-        """The numba-cuda pattern: reset, then re-init for the next test."""
-        dev = Device(0)
-        dev.set_current()
-
-        obj, kernel = _compile_and_get_kernel()
-        del kernel
-
-        handle_return(driver.cuDevicePrimaryCtxReset(0))
-
-        ctx = handle_return(driver.cuDevicePrimaryCtxRetain(0))
-        handle_return(driver.cuCtxSetCurrent(ctx))
-
-        del obj
-        gc.collect()
-
-
 class TestNonPrimaryContextDestroy:
     """Library/kernel destroyed after non-primary context is destroyed."""
 
@@ -119,23 +74,6 @@ def test_kernel_outlives_nonprimary_context(self):
         del kernel
         gc.collect()
 
-
-class TestKernelOutlivesObjectCode:
-    """Kernel transitively holds library; both outlive context."""
-
-    def test_kernel_outlives_objectcode_and_primary_context(self):
-        dev = Device(0)
-        dev.set_current()
-
-        obj, kernel = _compile_and_get_kernel()
-        del obj
-        gc.collect()
-
-        handle_return(driver.cuDevicePrimaryCtxReset(0))
-
-        del kernel
-        gc.collect()
-
     def test_kernel_outlives_objectcode_and_nonprimary_context(self):
         ctx = _create_nonprimary_context()