Fix #2050: Fix __eq__ implementations

[mdboom]

This bug was found with the static type-checking in #2061.

__eq__ overrides have to handle /any/ type being passed into them, and should not blindly access members of what is passed in.

[github-actions]

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[rwgk]

Cursor GPT-5.4 Extra High Fast

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Findings

• No issues found. For the scope of PR 2067, the tests look reasonably complete.
• cuda_core/tests/test_event.py covers both sides of the IPCEventDescriptor.__eq__ fix: unrelated-type comparisons now follow Python's rich-comparison protocol, and same-type comparisons still preserve the intended value semantics.
• cuda_core/tests/test_strided_layout.py does the same for _StridedLayout: it exercises ==, !=, reverse comparison, and the direct __eq__NotImplemented contract, plus a same-type equality/inequality smoke test.

Assumptions

• cuda_core/tests/test_object_protocols.py does not include IPCEventDescriptor or _StridedLayout in the shared equality matrix, so these focused tests are the primary regression coverage for those two types.
• That looks acceptable for this PR because the production change is narrowly scoped to those two __eq__ implementations.

Verification

• Ran TestVenv/bin/python -m pytest cuda_core/tests/test_event.py -q and got 28 passed, 2 skipped.
• Ran TestVenv/bin/python -m pytest cuda_core/tests/test_strided_layout.py -q and got 689 passed.
• The added coverage matches the regression described in issue #2050 and also checks that same-type equality behavior remains intact.