The F_COUNTRIES bullet claimed "there is a test asserting this" and pointed at
frontend/format.py — the superseded Python service. Name the Go and browser
copies that are actually deployed, and state where each assertion really runs:
the backend cross-check skips inside the frontend image build (backend/ is
outside that build context, and the builder stage is the only place CI runs
those tests), while the units.js check does run there.
Claude-Session: https://claude.ai/code/session_01AfXqHrxCJLs2D7hpQkiUiJ
