The session event gRPC stream may silently disconnect without triggering
onError or onCompleted callbacks. This causes session_started events to
be lost, preventing the sign process from starting.
Changes:
- Add ensureSessionEventSubscriptionActive() to refresh event subscription
- Call it in joinSignSessionViaGrpc for sign joiner
- Call it in createSignSession for sign initiator after auto-join
This ensures a fresh event stream connection before waiting for events.
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Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
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