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hive-forge: die by SIGPIPE like every other CLI in a pipeline

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Rust's runtime sets SIGPIPE to SIG_IGN at startup, so writing to a pipe
whose reader has gone away returns EPIPE and println! panics. `hive-forge
<verb> | head` printed a panic and exited 101 where cat, grep and every
other pipeline member exit quietly.

101 is not cosmetic: to a caller running `set -o pipefail` it is a real
failure, so a shell script that pipes our output stops on a condition
that is not an error.

Restore SIG_DFL first thing in main, before any output. Measured against
the same command: piped to head, 141 (killed by the signal) with empty
stderr; unpiped, 0; the pre-change binary, 101 with a panic.

Closes #3972
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atlas 2026-09-02 17:14:18 +02:00 • committed by mara
commit e0c2f1aeaa
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@ -1740,6 +1740,7 @@ dependencies = [
"anyhow",
"clap",
"forgejo-api",
"libc",
"reqwest",
"serde",
"serde_json",