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Diego Rodrigues de Sa e Souza 45b0672628 Combo + quota-shared deep audit: 5 fixes + strategy validation + E2E + complexity routing (#3779)
Deep audit of the combo + quota-shared system, delivered as 4 TDD waves.

- Wave 1: repair 5 dead/broken rules — streaming USD recording, pool-usage
  provider resolution, provider-diversity wiring, maxComboDepth threading,
  scoring clamp/NaN-safety (incl. connectionDensity).
- Wave 2: validate every auto-router strategy (cost / latency / sla-aware / lkgp
  / selectWithStrategy + aliases) and the predictive-TTFT decision.
- Wave 3: E2E coverage — 3-hop priority failover, per-target timeout failover,
  real strategy:auto dispatch.
- Wave 4: complexity-aware routing (2026, opt-in) over the existing specificity
  detector, plus revival of the dead tierAffinity / specificityMatch scoring
  factors (require-in-ESM root cause -> static import).

Proxy/credential isolation verified clean (each target uses its own
credentials+proxy via AsyncLocalStorage). file-size reconciled (combo.ts
re-baseline after extracting buildComplexityRoutingHint to complexityRouter.ts;
base.ts release-drift from #3780). Fast Quality Gates + semgrep green.
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