Why: A budget-stopped task retained a promise to generate a final result, while readable card errors need the full diagnosis in the execution record.
Evidence: Continuation-promise and missing-error-record regressions failed on the prior implementation; the full Backend suite now passes.
Impact: Terminal next steps require user action, stopped work has clear labels, and precise subagent errors persist outside the default task summary.
Refs: Independent A04 model assessment; approved R08 and R10
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