Consolidated from PR #106543 (5 commits, final tree d2c4d908) by @Totoro-qaq.
publish_compression_child() fails closed on any non-automatic end stamp and
end_session() is first-stamp-wins, so a stale tui_close on a session the TUI
still routes turned every rotation into "compute the summary, then discard it"
(#106459). The host that still routes the session clears the stale explicit
close via SessionDB.reopen_if_explicitly_closed() before the turn starts;
publication never heals explicit closes. Review probes by @ehz0ah.
9cd1453f26