Purpose: The SPECTRE specifications define 8 game-facing Shachi SDK
APIs (VMU, SH4 Math, Assets, Materials, Compositor, Tasks, Asset
Manager, Profiler) built on KOS for Dreamcast. The SDK prescription
provides an architecture roadmap. SHACHI-PROBE is a PVR2 divergence test
ROM. The pattern encyclopedia catalogs cross-platform Dreamcast
development patterns derived from commercial games (D2/Warp). The C
headers are the actual Shachi SDK API implementations.