The keeper's hand-made receive (subscribe to the call's chunks, ask, receive in order, acknowledge each) moves into mesh-sdk's process.Conn.CallChunks; the keeper's answer checks (an answered error, the space it fits, no chunk granted) run as its accept hook before a chunk is taken. Builds: design 47 G A-291 Claude-Session: https://claude.ai/code/session_01NcbgfGKaxw984XyAPfLm4h