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32cd19a714
Pure move, no behaviour change. First of ~7 PRs decomposing the combo.ts god-file (#3501). handleComboChat evaluates a series of dispatch branches before it ever reaches target resolution or the sequential attempt loop. None of them iterate targets in priority order or need the failover/retry/credential gate machinery that follows, so they move to a leaf: - context-cache pin routing (Fix #679), including the pinIsDurablyUnhealthy / isPinnedModelDurablyUnhealthy health gate - fusion panel dispatch + the #6455 misconfiguration warn - pipeline chaining - nested combo-ref execute-mode runtime-unit dispatch Only the chaos and round-robin hand-offs stay inline (11 and 13 lines); extracting those would be pure indirection. open-sse/services/combo.ts 3642 -> 3341 (-301) open-sse/services/combo/dispatchPrelude.ts: 619 (under the 800 cap) Each helper keeps the fall-through protocol the inline blocks had: return a Response to OWN the request, return null to fall through. A flipped null/Response would silently bypass the whole combo strategy, so the new tests pin both directions for every branch. combo.ts re-exports pinIsDurablyUnhealthy so combo-pin-health-gate.test.ts keeps resolving. The leaf takes handleComboChat as a `runCombo` parameter instead of importing it, so combo/ keeps zero back-edges into combo.ts. Complexity-neutral: the first cut added +3 violations (two max-lines-per-function, one complexity) inside the new leaf, so evaluatePinnedResponse, orderRuntimeUnits, recordRuntimeUnitStickySuccess and buildBaseOptions were split out. check:complexity now measures 2169 and check:cognitive-complexity 956 — identical to the pristine base. Co-authored-by: diegosouzapw <diegosouzapw@users.noreply.github.com>