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8889cea38b
The reconnect-blank-screen bug: when sr_cli exited (quit / idle timeout / crash) the while-true wrapper restarted it mid-session with no client attached, so its startup CPR probe (\e[6n) went unanswered and the TUI degraded/blocked. On reconnect lazy_started=True skipped recreation, so the client saw a blank screen. Fix: drop the while-true wrapper. Now when the CLI exits, the exec pty closes (EOF), the broadcast task ends, and the next client connection detects the dead upstream via _upstream_alive() and recreates the exec — with a terminal attached, so CPR is answered. A live exec is reused (just a Ctrl-L redraw). _LazyExecTelnetServer is extracted from a closure to module level so the reconnect/recreate logic is unit-testable. Add 9 tests covering _upstream_alive states and the recreate-on-death / reuse-if-live / close-half-dead-writer / no-while-true behaviors. Full Docker suite (120) passes.