Discovery-stage clarifications could only be answered over WebSocket
(ClientMessage.ClarificationResponse), so the curl-based headless QA
driver parked forever at discovery.
Add POST /sessions/{id}/clarify mirroring approveStageRoute. The server
resolves the live (stageId, requestId) from the session id via
SessionOrchestrator.pendingClarificationFor() — the newest still-live,
unanswered ClarificationRequestedEvent from the event log — so a curl
caller need not know the requestId. Empty answers = free-text skip.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
kami
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