generated from mathias/template-go-web
`LOOP_MODEL: ${{ inputs.model }}` sets the env var to "" when no model input is
given. An env var set-but-empty is NOT unset, so it overrode loop.py's
berget/gemma4-31b default, and every agent call POSTed "model":"" → HTTP 400
Bad Request. The loop ran but optimized nothing (best == baseline, delta 0).
Real overrides already flow through the conditional `--model` arg, so this env
line was redundant as well as harmful. Remove it; loop.py's default applies.