Note 155: a manifest-reads-changed said before the assigner's consumer existed was never heard, and ace's bootstrapped statement stood. Each part registers the engine-reads keeper's AtBind on its hub and calls the verb as a kept call (CallKeptOn). The asks-at-bind half (Q7) is not in this commit. Claude-Session: https://claude.ai/code/session_01JG73KEq4zoDfM9WtYpcQgZ