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b0bc0b5792
Every session event now lives inside a turn (between turn/start and its turn/end). The loop records queued user/message events AFTER turn/start; an idle agent.inject() wraps its context/message in a one-shot injection turn. This makes the turn the single durability/replay boundary so a persistence backend can treat anything after the last turn/end as a crash tail without dropping legitimate between-turn context. A failure once the turn is already closed (rejecting session/flush, a throwing agent/turn-end listener) has no in-turn position for a session error event, so it is reported via agent/error + logger only; the turn stays balanced. failTurn appends an error event only while the turn is open. The dsh-invariants plugin enforces turn-enclosure via a default case: every non-boundary event type — including plugin-added merge-extensible keys — must sit inside an open turn or it throws. Documented in ADR 0017 + architecture.md.