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Bloco J (hot-path decomposition), Task 1. Extract the per-target-timeout dispatch wrapper
(handleComboChat's handleSingleModelWithTimeout closure) verbatim into the leaf
combo/targetTimeoutRunner.ts as a factory buildTargetTimeoutRunner({handleSingleModel,
comboTargetTimeoutMs, log}). The per-model abort still comes from target.modelAbortSignal,
so the outer request signal is intentionally not a dependency. Host call-sites unchanged.
combo.ts shrinks ~60 LOC; leaf is 91 LOC (<800). Body byte-identical (verbatim), no cycle.
This is the first slice toward extracting the shared attempt-loop/success/error handlers
(Tasks 3-4) that de-duplicate handleComboChat and handleRoundRobinCombo. Adds a dedicated
test (5) so the failover path can be mutated independently. Consumer tests stay green
(combo-strategy-fallbacks 24, combo-499-abort 5, empty-content-failover 3, body-400-stop 1,
priority-quota-exhaustion 2, rr-streaming-lock 1, rr-session-stickiness 2).
Plan: _tasks/superpowers/plans/2026-07-03-blocoJ-combo-hotpath-decomposition.md