A pump the lifecycle retired or abandoned that finished after the restart
installed the new session published its stale cursor onto it (PublishAgentCursor
only checked for a null or identical session), so the next pump read its first
chunk as an Agent restart: index cleared, a Bad flicker on every subscribed tag,
a needless re-baseline. The pump now carries the session generation it was
started against; the cursor publish is checked under _subscriptionLock (where the
session install and generation bump are atomic) and a superseded pump also stops
folding late chunks / re-baselines into the new session's index.
Refs #743
Claude-Session: https://claude.ai/code/session_01Ub9hGmYLQvn9XETzw7CMsT
Joseph Doherty
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