D3-04 KOS / Shachi Foundry

Objective

Provision and prove a Dreamcast build path usable by future agents, ideally on the Pi HDD, with Mac fallback documented if native Pi build is impractical.

Inputs

• ops/toolchains/KOS_SHACHI_PROVISIONING.md
• ops/toolchains/kos-smoke
• T7 Shachi/POLYGON references
• docs/DREAMCAST_DEV_INTEL.md
• intel/shachi-atoms/shachi_atoms.db