Runs on push/PR to codex/staging-baseline plus manual dispatch: sbt test for
the backend, and npm ci/typecheck/build/audit (full + production-only) for
the frontend, matching the checks already documented as the manual Rocky
verification routine. Verified sbt test compiles and passes with no .env
file present (matching what a checkout-only CI job will actually have) via
a git-archive dry run before writing this.
Two separate jobs, each with its own container image, rather than one
shared runner-label image with ad-hoc installs — reuses the exact
hseeberger/scala-sbt image already used all session for local backend
builds, and a plain node:20-bookworm for the frontend, so nothing needs
apt-get bootstrapping of a second language runtime into the same container.
b0txec
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