v0.1.1 – Header/CPP sync, comment polish, demo verified

This PR finalizes the initial ds-runtime release polish.

Changes:

• Synchronize ds_runtime.hpp and ds_runtime.cpp
• Restore and complete all design-intent comments
• Fix Queue::Impl forward declaration and ownership
• Validate end-to-end CPU backend demo

Notes:

• No behavioral changes to the public API
• Demo output verified locally
• Intended as release-prep polish for v0.1.1

v0.1.0 – Initial CPU backend and queue architecture

This is the initial public release of ds-runtime, an experimental
Linux-native runtime exploring DirectStorage-style I/O semantics.

Included in this release

• Asynchronous request queue (ds::Queue)
• Pluggable backend interface (ds::Backend)
• CPU backend using POSIX pread()
• Completion tracking and blocking waits
• Demo application exercising multiple concurrent requests
• Clean C++20 API with header/implementation separation

Notes

This release focuses on correctness and structure, not performance.
The CPU backend serves as a reference implementation and foundation
for future backends.

GPU/Vulkan backends and real compression formats are planned for
subsequent releases.

Intended audience

• Linux systems programmers
• Graphics / Vulkan developers
• Wine / Proton contributors interested in DirectStorage semantics

Feedback on API shape, backend boundaries, and integration strategies
is welcome.