- selfhost_build.sh: HAKO_USE_BUILDBOX=1 uses BuildBox.emit_program_json_v0 for emit-only paths - Fix ROOT detection in selfhost and bridge negative smokes - All selfhost smokes pass (opt-in)
- selfhost_build.sh: HAKO_USE_BUILDBOX=1 uses BuildBox.emit_program_json_v0 for emit-only paths - Fix ROOT detection in selfhost and bridge negative smokes - All selfhost smokes pass (opt-in)