providerFromUrl() classified the upstream by URL path shape. With hundreds of
providers in the catalog that is wrong in both directions: '/chat/completions'
matched every OpenAI-compatible upstream (opencode.ai/zen was being reported as
'openai'), while OpenAI's own GPT-5.6 dispatches go to '/v1/responses' and came
back 'unknown'. Classify by hostname instead, and return 'host:<hostname>' for
unrecognised hosts so an unexpected dispatch names itself in the failure message.
combo-matrix/auto.test.ts additionally assumed the auto pool contained only the
connections it seeded, but no-auth providers (#6557/#7622) legitimately join the
pool without a seeded connection. Block those in beforeEach so the pool is closed
to the seeded connections — preserving what the assertions are actually about
(LKGP pinning, variant pool resolution) rather than relaxing them to accept
whatever an open pool picks.
Verified: auto.test.ts 2/2, and all 9 combo-matrix files 27/27 with no
regressions (no test was passing on the old helper's false 'openai' label).
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