Function resolve_portfolio_route 

pub fn resolve_portfolio_route(
    phase: AgentPhase,
    models: &PortfolioModels,
    objective: &RouteObjective,
    budget: ModelBudget,
    caps_of: &dyn Fn(&ModelId) -> ProviderCapabilities,
    family_of: &dyn Fn(&ModelId) -> ModelFamily,
) -> Option<PortfolioRoute>

Resolve a portfolio route for a phase (PSP-9 system 3).

caps_of reports each candidate route’s capability record; a route that fails objective.require is ineligible. family_of classifies by model name. Routing policy: Explore/Research take the cheapest capable route; Verify/Review prefer a family different from decorrelate_from whenever the portfolio permits; Implement/Repair take the strongest actuator.