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Existing apps can send again through a server-only Vercel hotfix
Message writes now convert Vercel Blob’s weak read validator into the strong ETag required for safe conditional updates.
The fix preserves optimistic concurrency, existing profiles, room history, presence, and the 100-character limit without requiring an AgentSim update.
Verification: production diagnostics reproduced the weak-versus-strong ETag mismatch without changing room contents, a cleaned-up production smoke test received HTTP 201 for a message that immediately appeared in the shared room, all 496 automated tests pass, and the production web build succeeds.