Dependencies

• Internal: T1 (Project Docs & PRD — README.md, PRD.md referenced in SB-001/INDEX.md); T3 (Toolchains & Build — Makefile structure and kos.mk defined in SB-010); T4 (SPECTRE & SHACHI — SPECTRE specs and SHACHI encyclopedia are the foundational pattern/spec references)
• External: KallistiOS (KOS) SDK, SH-4 cross-compiler (sh-elf-gcc), Dreamcast PVR2 hardware, Maple bus protocol, dcload (serial debug), Python 3 + Pillow (font conversion), Docker, Forgejo, Flycast emulator