Scope events export when their OWNING scope closes. Turn scopes close
every turn; session scopes close only at session end. Marks were attached
to the session handle, so a long-lived conversation — a Slack thread open
all day, the normal enterprise case — emitted no approval or turn marks
for hours, and none at all if the process died first. Audit dashboards
showed an empty approval table while approvals were demonstrably firing;
the operator had to end the session to see anything.
Attach marks to the live turn handle when one exists for the mark's
session (active_turn already validates live/same-profile/same-session/
unreleased), falling back to the session handle otherwise — correct for
session-level events like session.end and for marks emitted outside a
turn. Parentage semantics are unchanged: the turn is a child of the
session, so the session tree is identical, only export cadence changes
from per-session to per-turn.
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