Add checked Vulkan queue submission

[antono3]

Summary

• add Queue.submit for primary command buffers with optional waits, signals, and fence
• validate non-empty command batches and matching wait semaphore/stage-mask counts
• preserve raw Vulkan statuses and typed VulkanError failures
• document submission usage and cover validation without invoking Vulkan

Local checks

• v fmt -verify ergonomic/ergonomic.v ergonomic/ergonomic_test.v
• v -check-syntax ergonomic
• git diff --check

Compilation is delegated to GitHub Actions.