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## Summary Buzz Mobile now expands decrypted ACP observer batch envelopes into their inner telemetry frames before sending them through the existing per-agent dedupe, ordering, cap, and channel-filter pipeline. Singleton observer events keep their existing behavior. Malformed batch envelopes remain visible as outer frames, matching the desktop consumer convention, while invalid inner frames use the existing observer decrypt error path. This restores batched agent progress, tool activity, and incremental transcript updates that Mobile previously ignored. ### Related issue Related to #4917. ### Testing Added tests: - [`observer_subscription_test.dart`](https://github.com/block/buzz/blob/main/mobile/test/features/channels/agent_activity/observer_subscription_test.dart) covers valid batches, singleton behavior, malformed envelopes, and invalid inner frames. Full mobile analysis, formatting, file-size validation, and Flutter tests passed. The repository pre-push gate also passed. --------- Signed-off-by: Tom Brow <tomb@block.xyz> Co-authored-by: Tom Brow <tomb@block.xyz> Co-authored-by: Codex <noreply@openai.com>