Keep execution statistics by conversation and project so returning to a viewed conversation immediately restores its reply duration while refreshing in the background. Preserve late-result isolation and clear failed scopes.
Validation: 15 focused tests, typecheck and lint passed. Full suite: 4878 passed, 9 navigation settings assertion failures and 1 Agent package timeout outside this change.
Release note: Switching back to a viewed conversation now immediately displays its cached cumulative Agent reply duration while refreshing the statistics.
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