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Mesh and geohash timelines are now store conversations. All public mutation sites flow through store intents; PublicMessagePipeline keeps its 80ms UI batching but commits batches via store appends with each buffered entry carrying its destination conversation (a mid-batch channel switch now flushes instead of dropping the buffer). ChatViewModel.messages becomes a cached get-only view of the active conversation, invalidated through the change subject. The mesh late-insert threshold is consciously removed: it only ever ordered the non-rendered messages copy, so strict timestamp insertion makes the working set agree with rendered order. PublicTimelineStore and the per-message full-array legacy sync are deleted; the coalescing bridge mirrors public conversations for the remaining legacy readers. pipeline.publicIngest: 6.6k -> 9.5k msg/s (+45%); private steady; store.append 237k/s. Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>