- Replace msg_info/stop_spinner with plain echo for telemetry reporting
The background spinner process in non-interactive shells (bash -c)
can trigger SIGTSTP, stopping the entire process group before the
recovery dialog appears. Plain echo avoids this.
- Add trap '' TSTP at failure path entry to ignore suspension signals
Prevents Ctrl+Z or terminal-related SIGTSTP from interrupting the
recovery menu. Restored with trap - TSTP before exit.
- Root cause: msg_info starts a background process (spinner &) that
is not properly detached in non-interactive shells where job control
(set -m) is OFF. The disown builtin has no effect without job
control, leaving the spinner in the same process group. This can
cause terminal I/O conflicts during the 33-second post_update_to_api
retry window, resulting in [2]+ Stopped.
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