fix: harden model catalog projections

backend/src/pi/list-models.ts

@@ -10,6 +10,7 @@ import {
   readConfiguredPiAgentFile,
   validateDeclarativePiConfig,
 } from "./managed-config.js";
+import type { RuntimeModelCatalog } from "../models/runtime-model-catalog.js";
 
 export interface PiModel {
   provider: string;
@@ -30,6 +31,7 @@ interface Opts {
   nowMs?: () => number;
   loadEnabledModels?: () => PiEnabledModelsResult;
   readModelsStore?: () => string | undefined;
+  modelCatalog?: RuntimeModelCatalog;
   warn?: (message: string) => void;
 }
 
@@ -82,9 +84,23 @@ export function createPiModelLister(cfg: AppConfig, opts: Opts = {}): ListModels
       const byCompositeId = new Map(
         available.map((model) => [`${model.provider}/${model.id}`, model]),
       );
+      const catalogByPiId = new Map(
+        (opts.modelCatalog?.sessionModels() ?? []).map((model) => [
+          `${model.provider}/${model.upstreamModel}`,
+          model,
+        ]),
+      );
       const models = enabled.ids.flatMap((id) => {
         const model = byCompositeId.get(id);
-        return model ? [model] : [];
+        if (!model) return [];
+        const catalogModel = catalogByPiId.get(id);
+        return [catalogModel ? {
+          ...model,
+          provider: catalogModel.provider,
+          id: catalogModel.model,
+          name: catalogModel.label,
+          reasoning: catalogModel.session?.reasoning ?? model.reasoning,
+        } : model];
       });
       if (models.length === 0) opts.warn?.("No Pi-enabled models are currently available");
       cache = { at: now(), models };

backend/src/pi/pi-process-manager.ts

@@ -260,8 +260,11 @@ export class PiProcessManager {
     const thinking = o.thinking ?? this.cfg.defaults.thinking;
 
     if (provider && model) {
+      const upstreamModel = this.modelCatalog.sessionModels()
+        .find((entry) => entry.provider === provider && entry.model === model)
+        ?.upstreamModel ?? model;
       const response = await rt.rpc.request(
-        { type: "set_model", provider, modelId: model } as object & { type: string },
+        { type: "set_model", provider, modelId: upstreamModel } as object & { type: string },
       );
       rt.bridge.setContextWindow(response?.data?.contextWindow);
     }

backend/src/pi/provider-smoke.ts

@@ -79,6 +79,7 @@ export function createPiProviderSmoke(
         || catalog.defaultSession !== null;
       const catalogModel = catalog.sessionModels()
         .find((entry) => entry.provider === canonicalProvider && entry.model === model);
+      const upstreamModel = catalogModel?.upstreamModel ?? model;
       const credentialName = catalogModel?.authentication.mode === "secret_env"
         ? catalogModel.authentication.apiKeyEnv
         : undefined;
@@ -130,7 +131,7 @@ export function createPiProviderSmoke(
       const capabilityGuard = failOnUnexpectedCapabilities(rpc);
       const turn = async (): Promise<void> => {
         requireSuccessfulResponse(await rpc.request({
-          type: "set_model", provider: canonicalProvider, modelId: model,
+          type: "set_model", provider: canonicalProvider, modelId: upstreamModel,
         } as object & { type: string }));
         requireSuccessfulResponse(await rpc.request({
           type: "set_thinking_level", level: reasoning,