When a git-sync body write (gitSyncWriteBody) is routed to the collab instance
that owns the doc, the handler runs remotely inside handleRedisMessage and CAN
throw (markdown->ProseMirror transform). Previously the throw was uncaught: the
customEventComplete reply was never published, so the origin's writePageBody
promise only rejected after customEventTTL (~30s) as a generic 'TIMEOUT', and an
unhandledRejection escaped the async messageBuffer listener on the owning
instance.
Now the owner wraps handleEventLocally in try/catch and, on throw, publishes a
customEventComplete carrying an `error` field on the same correlation channel.
The origin's pendingReplies holds {resolve, reject} and rejects promptly with the
real Error. The TTL TIMEOUT remains as the fallback for a genuinely lost reply.
The no-throw and local (same-instance) paths are unchanged.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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