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* fix(client): count threads, not checkpoints, in list_threads checkpointer.list(None, limit=N) returns the newest N checkpoints across every thread, so one long conversation filled the limit and hid the rest: the TUI thread picker and --resume <title> only saw the latest one or two threads. List threads through their single step -1 root checkpoint instead, then read the latest checkpoint per returned thread. Add sort_by="updated_at" so --continue keeps resuming the most recently active thread rather than the most recently created one. * test(client): pin list_threads scan cost and namespace filtering; docs * docs(client): state list_threads cost as checkpoints loaded, not rows scanned * docs(changelog): reference #6426 * fix(client): list threads by checkpoint write order, including branches Discovering threads by their step -1 input checkpoint dropped Gateway branches, which are seeded through update_state (step 0), and ordering by checkpoint ts missed goal writes, which copy the previous ts under a fresh checkpoint id. Enumerate threads from the checkpoint primary-key index on SQLite and Postgres (unwrapping the delta-history cache), falling back to one list(None) walk for any other saver, and order by checkpoint_id, the key LangGraph itself uses for a thread's latest checkpoint.