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* perf(mobile-sync): memoize the agent-status projection per entry buildRuntimeMobileAgentStatusProjection re-serialized every live agent on every status ping. setAgentStatus replaces one entry and re-spreads the map, which defeats the reference-equality skip gate, so each ping paid for every other agent's prompt, 20-entry history, and 8 KB assistant message to discover they had not changed. Memoize each row's JSON by entry identity, the cachedTabsProjection pattern already used a few functions above. Per ping: 0.18 ms -> 0.014 ms at 8 agents, 0.88 ms -> 0.063 ms at 40. The output is byte-identical — joining pre-serialized rows matches whole-array stringify, which the new test pins against a verbatim copy of the old implementation. * test(perf): stop inflating the projection benchmark baseline The pre-fix arm stringified each row and parsed it back before stringifying the array, a per-row roundtrip the original never paid. That made the baseline artificially slow: the reported 5.9x-14.0x is really 2.1x-5.0x. Share one row builder between both arms, and check equivalence after a ping as well as on the cold call — a stale-row bug can only surface once the cache is actually exercised, which the cold-path check could never catch.