Option A ("ask inline, session stays open") described a path where the
errand agent could ask questions without writing signal.json, which broke
the server's completion detection (checkAgentCompletionResult polls for
done|questions|error status). Remove the Option A/B distinction and make
signal.json with questions status the single mechanism for all user-input
requests, consistent with how other agents handle blocking questions.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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