Verification Checklist

• All TODOs removed from workspace/shachi/ source files
• All stubs documented with clear comments
• No TODO/FIXME/XXX/HACK in workspace/shachi/
• Mesh loading works (implemented via sh_mesh_load)
• Sound loading documented as intentional stub
• KOS thread integration documented as intentional stub
• PVR2 integration stubs documented
• All stubs return safe defaults
• No new TODOs introduced
• TECHNICAL_DEBT.md updated