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Summary
Prevent premature Vulkan resource destruction when fence or queue waits cannot prove GPU completion. Cover converter, encoder, and context teardown including retired semaphores. Distinguish successful waits and device loss from other errors.
Validation
Source-reviewed; Rust CI, fault-injection tests, and Vulkan validation remain pending.
Limitations
Exceptional failure paths may leak resources. Borrowed-device queue synchronization requires review. External DMA-BUF lifetime is not addressed. Do not merge until validated.