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293b981464
GitHub Actions expression string literals don't interpret `\n`, so
`toJSON(format('...\n...'))` emits literal `\\n` and Slack renders the
two characters backslash-n instead of a line break. Inject real newlines
via a `fromJSON('"\n"')` placeholder, matching the starter-smoke fix.
Fixes the "all builds failed" and "Showcase Build Failed" alerts in
showcase_build.yml and the multi-line "showcase_validate failed" alert
in showcase_validate.yml. showcase_promote.yml already used the
fromJSON placeholder; the single-line validate alert has no newlines
and was left untouched.