test/nav_manifest_test.dart derives docs/nav.generated.json from
the _pages list (order = Cmd numbers), the labelOf switch, and both
.arb files. On any nav change it regenerates the manifest and fails
once with instructions to commit + mirror it to
fai_chain/docs/studio/, where the platform repo's docs_consistency
gate checks the operator guide against it — cross-repo nav drift
becomes a red gate instead of quietly rotting docs.
Signed-off-by: flemming-it <stefan.a.flemming@googlemail.com>