coderai always runs as front + engines, so drop the single-process special-casing
in execute_api_request: always hand the sub-request to the front (the single API),
which routes it to the engine that owns the target model. Critically, remove the
on-error fallback to in-process dispatch — that would silently run the model on the
WRONG engine and hide a routing failure. If the front can't be located/reached it
now returns a 502 the caller surfaces. Drops the now-unused os import.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01RdMufYvtTbtGDWsiZVoXce