Follow-up to #106866 from the post-merge audits (@ehz0ah, @victor-kyriazakos):
- _recoverable_pool_provider: the "endpoint mismatch, not a dead key" shield now (a) compares the full
origin via base_url_origin() (scheme+host+port — a different port or an HTTPS->HTTP downgrade is a
different trust boundary) and (b) applies only when the rejected client carried the SESSION's key, so
an independently owned auxiliary pool keeps rotating at its own configured origin.
- _resolve_named_custom_branch: explicit/per-task base_url and api_key compose OVER the providers.<name>
entry field-by-field instead of the entry silently replacing them (URL-only, key-only, both, neither).
- _acreate_with_progress: plain-create fallback only for a rejected stream NEGOTIATION (mirrors the sync
wrapper); a mid-stream failure propagates to the classified recovery ladder instead of re-sending the
whole prompt non-streaming.
Tests (all red on main): foreign origin x {host, port, scheme} shields the session key; same origin and
independent aux pool still rotate; named-provider override matrix through resolve_provider_client on a
real temp HERMES_HOME; async content-then-error is not retried non-streaming.
`auxiliary.<task>.provider: openai` was rewritten to custom + api.openai.com/v1 unconditionally, and the
api-key discovery rung used the registry default endpoint, so proxy/gateway users (OPENAI_BASE_URL or
providers.openai) had compression hop to the public endpoint with a proxy-issued key -> 401 -> the
key/pool was quarantined and the session sat over the compression threshold.
- _expand_direct_api_alias: a providers.openai entry keeps its name (named-custom branch applies its
base_url/key); otherwise OPENAI_BASE_URL wins over the public default.
- _resolve_api_key_provider: when the bound session runtime is that provider, use its endpoint + key.
- _recoverable_pool_provider: a rejection at a host other than the session's configured endpoint for
the same provider is an endpoint mismatch, not a dead key -> no rotation / unhealthy mark on the pool.
Teknium