pub const DEFERRED_STDOUT_FILE: &str = ".report_stdout.md";Expand description
Session-dir file holding end-of-run summary output that is
routed to stdout (SRD-46 to stdout) but could not be written
inline because a TUI owned the terminal. The post-run printer
flushes it verbatim once the terminal is back in cooked mode.
Dot-prefixed, and deliberately NOT matching the _summary.
artifact pattern: artifacts are the sessiondir destination,
and their presence must never by itself imply a stdout write.