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* fix(combo): fallback to sibling model on 500 for per-model-quota providers Two issues prevented combo fallback when gemini/gemma-4-31b-it returned 500: 1. targetExhaustion: connection-level exhaustion marked the shared gemini connection as exhausted, skipping the sibling model (gemma-4-26b-a4b-it). Skip markConnectionLevelExhaustion for per-model-quota providers (gemini, github, passthrough, compatible) since a model-level 500 does not mean the connection is bad. 2. combo retry loop: the auth layer records a model lockout on 500, but the retry loop did not check isModelLocked before retrying — it retried the same locked model instead of falling back. Add isModelLocked guard before the transient-retry decision. * fix tests timeout * fix: clear quota fallback CI gates * quality-gate: extract test SSE stream helpers * drop scope creep * fix(combo): retry sibling models only on 500 errors * fix(combo): reconcile onto release/v3.8.44 — keep targetExhaustion 500 fix, drop slow integration test Reconciled by maintainer onto the current release tip: - kept the core fix (targetExhaustion.ts model-500 guard for per-model-quota providers + the isModelLocked retry early-return in combo.ts) and its unit test - dropped tests/integration/combo-concurrent-failure-recovery.test.ts + _sseTestHelpers.ts: they use Math.random()-based delays and 30s timeouts, run >3min and are flake-prone in the test:integration CI job; the unit test (tests/unit/combo/combo-target-exhaustion.test.ts, 21 cases) fully covers the fix - CHANGELOG entry added Co-authored-by: diegosouzapw <diegosouza.pw@gmail.com> --------- Co-authored-by: Koosha Pari <kooshapari@gmail.com> Co-authored-by: Diego Rodrigues de Sa e Souza <diegosouza.pw@outlook.com> Co-authored-by: hartmark <hartmark@users.noreply.github.com> Co-authored-by: diegosouzapw <diegosouza.pw@gmail.com>