Runtime registries

export interface HarnessRegistryEntry<T> extends HarnessRegistryReference {
    implementation: T;
}

export interface HarnessRegistryReference {
    id: string;
    version: number;
}

export interface HarnessRuntimeBindings {
    driver?: ExecutionDriver;
    controller?: StepController;
    contextPolicy?: ContextPolicy;
    completionPolicy?: CompletionPolicy;
    modelRoles?: Readonly<Record<string, string>>;
}

export interface HarnessRuntimeReferences {
    driver?: HarnessRegistryReference;
    controller?: HarnessRegistryReference;
    contextPolicy?: HarnessRegistryReference;
    completionPolicy?: HarnessRegistryReference;
    /** Role -> approved host binding name; credentials/providers stay host-owned. */
    modelRoles?: Readonly<Record<string, string>>;
}

export interface HarnessRuntimeRegistry {
    driver?: readonly HarnessRegistryEntry<ExecutionDriver>[];
    controller?: readonly HarnessRegistryEntry<StepController>[];
    contextPolicy?: readonly HarnessRegistryEntry<ContextPolicy>[];
    completionPolicy?: readonly HarnessRegistryEntry<CompletionPolicy>[];
}

/** Registry resolution is static; it never initializes providers or executes drivers. */
export declare function resolveHarnessRuntime(definition: HarnessDefinition): HarnessRuntimeBindings;