Brummel
c750b9fbc3
Captures the pre-existing broken-pipe panic surfaced by the milestone fieldtest ([bug] finding): every multi-line subcommand (sweep / mc / walkforward / runs family / generalize) panics "failed printing to stdout: Broken pipe (os error 32)" and exits 101 when the stdout reader closes early (| head, | less, a closed UI pane), instead of terminating cleanly. Root cause: Rust's runtime resets SIGPIPE to SIG_IGN at startup, so a write to a closed pipe returns EPIPE and println! panics rather than the process dying quietly. crates/aura-cli/tests/cli_broken_pipe.rs spawns `aura sweep`, closes the stdout read end mid-stream, and asserts no panic in stderr + exit != 101. Verified RED (reproduces 6/6). The GREEN fix follows in the next commit. refs #146