feat: establish unified administration and model context baseline

backend/src/pi/management.ts

@@ -106,23 +106,23 @@ export function createPiManagement(config: AppConfig, deps: PiManagementDeps): P
   });
   const credentialStatus = deps.credentialStatus ?? ((provider: string | undefined) => {
     try {
-      const model = deps.modelCatalog.defaultSession
-        ? deps.modelCatalog.sessionModels().find((entry) => entry.id === deps.modelCatalog.defaultSession)
+      const model = deps.modelCatalog.defaultInteraction
+        ? deps.modelCatalog.sessionModels().find((entry) => entry.id === deps.modelCatalog.defaultInteraction)
         : undefined;
       const credentialName = model?.authentication.mode === "secret_env"
         ? model.authentication.apiKeyEnv
         : undefined;
-      const configuredApiKey = configuredPiProviderApiKey(
+      const configuredApiKey = credentialName ? `$${credentialName}` : configuredPiProviderApiKey(
         readConfiguredPiAgentFile("models.json", true),
         provider,
-      ) ?? (credentialName ? `$${credentialName}` : undefined);
+      );
       return piProviderCredentialStatus({
         provider,
-        authProviders: loadPiAuthProviders(),
+        authProviders: credentialName ? new Set() : loadPiAuthProviders(),
         resolveCredentialValue: () => credentialName
           ? secretValue(config, credentialName)
           : config.modelCatalogFile ? undefined : secretValue(config, "THT_MODEL_API_KEY"),
-        credentialFile: config.modelApiKeyFile,
+        credentialFile: credentialName ? undefined : config.modelApiKeyFile,
         configuredApiKey,
       });
     } catch {
@@ -152,8 +152,8 @@ export function createPiManagement(config: AppConfig, deps: PiManagementDeps): P
   const installationConfig = (): PiInstallationConfig => {
     const settings = readSettings();
     const reasoning = config.defaults.thinking ?? settings.thinking;
-    const selected = deps.modelCatalog.defaultSession
-      ? splitCanonicalModelId(deps.modelCatalog.defaultSession)
+    const selected = deps.modelCatalog.defaultInteraction
+      ? splitCanonicalModelId(deps.modelCatalog.defaultInteraction)
       : undefined;
     return {
       ...(selected ? selected : {}),