Shachi SDK Prescription — Architecture Recommendation for v0.1

Date: 2026-02-23 Input: SPECTRE First Pass (6 teams, 28 codex files, 34 KOS gaps, 10 Flycast divergences) Output: What to build, what to reuse, what to invent

The Problem Shachi Solves

KOS gives you raw hardware access but no intelligence. Kamui gave you intelligence but died with the Dreamcast. The gap between them is 34 features — including multi-pass rendering, texture lifecycle management, submission serialization, and the validation tools Sega never built.

Shachi is not “KOS but better.” Shachi is: KOS (hardware access) + Kamui’s intelligence (scene management) + what Sega never built (validation, modern asset pipeline, generative integration).