AC6 renderer architecture after the pivot
=========================================

Authoritative renderer
----------------------
Visible rendering now defaults to the vendored RexGlue/Xenia graphics backend.
The guest GPU command stream, the RexGlue D3D12 command processor, and the presenter remain the only authoritative presentation path in the default configuration.

AC6-specific layer
------------------
The AC6 code in this repository sits alongside that backend and provides:

- frame-boundary capture and shadow-state analysis
- swap-path inspection and overlay reporting
- AC6-specific pass classification and repeated-signature tracking
- timing telemetry for host frame pacing, guest vblank cadence, and audio queue state
- narrow extension points for future AC6 fixes and selective modding overrides

Experimental replay renderer
----------------------------
The legacy AC6 native replay renderer is retained only as experimental tooling.
It may still be initialized for research or selective override work, but it is not the shipping render path and it does not override presentation unless explicitly opted in at runtime.

Current default runtime behavior
--------------------------------
- `ac6_graphics_mode=hybrid_backend_fixes`
- `ac6_experimental_replay_present=false`
- render capture remains enabled by default

This keeps diagnostics and backend-fix infrastructure active without introducing a competing render authority.
