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Tests whether CUPTI recycles graphId values after cudaGraphExecDestroy, which would be the only scenario where the graphLaunchCache in TracyCUDA could serve stale entries for a non-matching exec handle. Result (H100, CUDA 12, CUPTI): graphId is a monotonically increasing counter that is never recycled. 22 create/instantiate/launch/destroy cycles produced unique IDs ranging from 2 to 65 (incrementing by 3 per cycle — one unit per node created during graph construction). This confirms that the stale-cache concern raised in code review is not a real risk in practice: two distinct exec handles always have distinct graphIds. Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>