Instance-page one-click Signal dead-ends structured-result nodes; route it through OutcomeSignaler

Routes the instance-page one-click branch signal through OutcomeSignaler when the branch is the parked node's own outcome, so the result is written under the node's result_variable in the shape its guards read. A branch that tested a structured result on its .result element previously received a flat variable write, never matched, and the token dead-ended, completing the instance without advancing. Adds a kernel regression test.