Document the project structure in detail
Add 42 pages covering architecture, repository layout, the static
translation pipeline, guest CPU and x87 model, the EngineHost Win32
layer, threading, memory, overrides, Direct3D 9 to Metal rendering,
shaders, textures and packs, geometry fast paths, radial fog, the
panorama, budget and pacing, the visionOS app and presenter, layer
alignment, audio, input, haptics, diagnostics, setup, build, signing,
visual mods, testing, release hygiene, every HALO_* environment
variable, a glossary, and open questions found during review.
Source links are pinned to master-chef 9f915af (v1.0.3).