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UpdateTaskState now writes a state_change event in the same transaction
as the row update, so the event stream and task state never diverge.
Adds UpdateTaskStateBy(id, newState, actor) for explicit actor
attribution; UpdateTaskState delegates with ActorSystem (correct for the
executor, which drives the state machine). RejectTask and
ResetTaskForRetry also emit state_change events attributed to the user.
API accept and cancel handlers now attribute their transitions to the
user via UpdateTaskStateBy. The executor's Store interface is unchanged,
so no test doubles needed updating.
https://claude.ai/code/session_01SESwn7kQ7oP62trWw6pc39
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New internal/event package defines the Event type with canonical Kind
and Actor constants. New events table is appended via additive migration
(id, task_id, seq, ts, kind, actor, payload_json) with seq as per-task
monotonic, assigned by the storage layer inside a transaction.
CreateEvent + ListEvents support the future migration of question_json,
interactions_json, summary, and elaboration_input off the tasks table
into a unified, replayable event stream. No existing code paths are
modified yet; this is pure substrate for Phase 1.
https://claude.ai/code/session_01SESwn7kQ7oP62trWw6pc39
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