- stateVersion starts at 1: the package is new, no persisted rows predate it
- pendingCalls pairs by own key so a provider callId naming a prototype
property cannot fold toolMs to NaN on an unmatched crash-recovery result
- StatsLine folds the window fallback only when no sessionStats value is
served, and gates the token group on actual token activity instead of
steps, so failed-only sessions drop the zero-token group
- correct the crash-step counting semantics in the README and Agent Note:
recovery closes interrupted steps with a synthetic step/end on reload
- reword the window-scoped alternative as a plain rejected option and name
isTokenDelta's home beside the StreamChunk type
