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3783f3e178
closeStep() previously caught and silently swallowed a throw from
agent/step-end emit. In the normal no-tool/no-steering path, this
caused runTurn to reach closeTurn(true) with reason still
{kind:completed}, so the session recorded a completed turn with
zero error events — even though a plugin had failed at a loop
boundary. This violates the contract that a throwing plugin is
contained as a turn error, not a silent success.
Now the catch calls failTurn(toError(error)), which appends the
single error event and sets reason={kind:error,…}. failTurn is
idempotent (errorReported guard), so existing error paths that
call failTurn after closeStep are unaffected.
Add regression test: a throwing agent/step-end listener during a
successful step now produces exactly one error event, a turn/end
with reason error, balanced boundaries (step/end before turn/end),
and a surviving loop.