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- recv_msg_timeout2 only gated the wait for the first byte, so a peer that sent one byte then stalled pinned the task forever. The same budget now also bounds the body read; a body that overruns is a hard error that tears the stream down (recv_msg bodies are small JSON, so a healthy peer never trips it). - The cursor cache is keyed by display index, which a rebuilt stream reuses, so a predecessor exiting after its replacement published a fresh cursor erased it. Stamp each entry with a monotonic per-stream epoch and compare-and-remove on teardown. - ProbeState::Available had no TTL, so an idle hotplug left a phantom display in enumeration. Give it a timestamp and refresh the list off the hot path once it ages past POSITIVE_TTL. The verdict stays true across the refresh (never bounces a live session to the portal) and the probe runs on a background thread (never blocks the async enumeration). - Remove the dead clear(): it is unreferenced, and wiring it into teardown would force the blocking re-probe on the next enumeration that swap_available_displays exists to avoid.