Integrate only the two reviewed improvements ontoeec4677. Storage tiles use one whole wide fine allocation; step(n) completes its unchanged one-stream schedule with one wait per call. Raw exchange retains the final interval; an open exchange window spans the completed batch. Storage-source: ab699854ae2fb0c994a14bfd7124dddbe50d8a88 Original-sync-author: Claude <claudeworker@noreply.invalid> Sync-source:ad1d82cb7fSync-doc-correction:512dcc923bValidated-local-sync-source: 65c001c3294a6eb45283568bf4967c673b33b19a Sync-stable-patch-id: a825dcd47b33c5c4d9be31e0071d2306eb344d0b Co-authored-by: Claude Opus 5.5 <noreply@anthropic.com>