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After two seconds of agent work, send one agent.progress frame with a synthesized "Hang on while I work on that." clip over the same binary audio channel (shared output-sequence counter), at most once per turn; screen-only agent.working heartbeats continue every 15 seconds. This is the change the 15:11 rebuild already shipped to the running server — committing it pins the protocol addition to the client that now tolerates and plays it. Co-Authored-By: Claude Fable 5 <[email protected]>