`run` reported "Broken pipe" (on Windows "The pipe is being closed") and exited 1 when the
reader of its stdout went away, unlike `commands` and the other subcommands, which end quietly.
Its step printer now treats a closed pipe as the end of output, not an error: the remaining
steps still run (an export is still written), unprinted, and the run exits 0. Other write
errors and failing steps still fail.
The test runs document.json, a rectangle and an SVG export with stdout closed: status 0, empty
stderr, the SVG written; `run --cmd not-a-command` still fails.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
# Conflicts:
# ROADMAP.md
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