tty shell: leave the terminal clean on every exit path. Root causes: vaxis.Tty.init makes the tty raw but run() never called tty.deinit (termios stayed raw -> no echo, staircased output in the spawner shell); the pty reader tasks were never joined (Kill-quit hung the exit in the runtime thread-join with readers blocked in read(2), and finished readers dumped DebugAllocator leak traces onto the tty). Fix: defer tty.deinit() (runs last, after vx.deinit flushes its resets); cancel each pty reader at teardown (cancel interrupts the blocked read) then close masters and drain the loop queue (queued pty_read/paste bytes are gpa-owned); await the reader on pty_eof before closing; readPty posts its eof via tryPostEvent so a post-cancel full queue can't re-block; root panic handler wraps vaxis.recover() so a panic restores cooked mode/main screen/mouse before the trace prints (vaxis.Panic itself is stale: references std.debug.FormattedPanic which 0.16 dropped). Verified with a scripted pty harness (bash spawner, DSR replies): both quit paths (exit-EOF of last pane, middle-click Kill) end with rmcup+cursor+sgr+mouse-off and identical stty -a before/after, no leak spew, prompt back in 0.5s; snap suite 18/18.

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