* fix(cli): render gateway transport failures as expected conditions
An unreachable gateway is an expected, recoverable operator condition, but
only the devices command family surfaced it through the root failure handler,
where it rendered as "The CLI command failed" with debug hints. Extract
GatewayTransportError into its own module so the failure renderer can classify
it without importing the transport stack, and treat it as an expected CLI
error alongside missing credentials.
* fix(gateway): import the transport error kind used by the JSON shape
* test(cli): extract the process-test gateway harness
The new devices coverage pushed gateway-backed-exit.process.test.ts past the
max-lines budget, and that file is not in the ratchet baseline. Move the mock
Gateway servers into a sibling test-helpers module instead of suppressing the
rule.
Peter Steinberger
01eec285d9