Settings → Model → Auxiliary gets a reasoning-effort selector per task next to the
provider/model pick (inherit / Off / level), sent as reasoning_effort on
POST /api/model/set and read back from GET /api/model/auxiliary.
(cherry picked from commit f09d008f10a81f57ed2426f835898c8e8ae595d7, resolved onto main; the backend half lives in
hermes_cli/web_server_config.py since the routers split and lands in the next commit)
cc7ee8d1f5