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Mohamed Boudra
4178497d3d
Agent timeline history had several writers that appended and published
independently, so a persistent backend could not be swapped in without
reordering or losing items. AgentTimeline now owns each agent's history:
one FIFO queue per agent (child agents share the parent's queue) commits
each item and then publishes it, so subscribers never see an item before it
is recorded. Backends may be async, which prepares the SQLite swap.
Terminal turn events wait for queued writes so a finished turn never races
its own last chunks. A subscriber that throws after commit leaves the item
in history. A failed commit surfaces as an agent error ("Conversation
history could not be saved") via the existing lastError/attention path; it
survives the turn's terminal transition and clears on the next run.