open_inference's error was wrapped with .context and printed through the
anyhow chain, so a refused non-loopback --base-url put the operator's address
on stderr. lane_fault maps each ControllerOpenError variant to one fixed
message; ControllerOpenError is exported for it. Fixes
local-endpoint-echoed. Builds; the workspace is unchanged elsewhere.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
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