Submission API

[attackgoat]

Summary

• Prepare vk-graph 0.14.2 from the published 0.14.0+alpha baseline.
• Document the graph, stream, submission, graphics/ray tracing rename, physical-device extension, and field rename changes in the changelog.

Public API Notes

• RenderGraph/graph::pass_ref APIs are replaced by root-level Graph, command builders, Submission, and reusable CommandStream support.
• graphic/ray_trace module and type names are now graphics/ray_tracing.
• Device::physical_device is now Device::physical.
• Extension support fields now use Vulkan extension names, with Option<physical_device::khr::...> structs where feature/property data is exposed.
• Ambiguous ty fields were renamed to domain-specific names.

Semver-checks compatibility failures against 0.14.0+alpha are intentionally ignored for this release.