Follow-up to @helix4u's #57336 salvage. Two review findings:
- W1: model-picker grouped custom-provider rows by
(api_url, credential, api_mode) but NOT extra_headers. Entries sharing a
URL+credential+api_mode yet declaring different headers (e.g. per-tenant
routing behind one proxy) collapsed into one row and probed /models with
whichever header set was seen first (order-dependent). Fold a canonical
header identity into group_key so distinct header-authed endpoints stay
separate; drops the now-dead first-non-empty merge branch.
- W2: the extra_headers stringify+None-filter comprehension existed in 5
copies (config.py x2, runtime_provider.py, model_switch.py, models.py).
Extract one shared hermes_cli.config.normalize_extra_headers primitive;
all sites now call it.
Tests: +normalize_extra_headers unit tests, +regression test proving two
same-endpoint entries with different headers stay distinct and each probes
with its own headers. 223 targeted tests pass; ruff clean.
kshitijk4poor
ed4123792c