fix(pi): inherit default model and api key for embedded agent

src/daemon/index.ts

@@ -44,11 +44,39 @@ import {
   type ExternalBackendName,
 } from '../backends/index.js';
 
+function collectModelApiKeys(config: Config): Record<string, string> {
+  const keys: Record<string, string> = {};
+  const candidates = [
+    config.models.default,
+    config.models.fast,
+    config.models.complex,
+    config.models.local,
+    ...Object.values(config.models.local_providers ?? {}),
+  ];
+
+  for (const candidate of candidates) {
+    if (!candidate?.provider || !candidate.api_key) {
+      continue;
+    }
+    if (candidate.api_key.trim().length === 0) {
+      continue;
+    }
+    keys[candidate.provider] = candidate.api_key;
+  }
+
+  return keys;
+}
+
+function defaultPiModelSpec(config: Config): string {
+  return `${config.models.default.provider}:${config.models.default.model}`;
+}
+
 export function createConfiguredExternalBackends(config: Config): {
   externalBackends: Partial<Record<ExternalBackendName, ExternalBackend>>;
   defaultName?: ExternalBackendName;
 } {
   const backends: Partial<Record<ExternalBackendName, ExternalBackend>> = {};
+  const modelApiKeys = collectModelApiKeys(config);
 
   if (config.backends.claude_code.enabled) {
     backends.claude_code = new ClaudeCodeBackend(
@@ -82,6 +110,8 @@ export function createConfiguredExternalBackends(config: Config): {
     backends.pi_embedded = new PiEmbeddedBackend({
       timeoutMs: config.backends.pi_embedded.timeout_ms,
       model: config.backends.pi_embedded.model,
+      defaultModelSpec: defaultPiModelSpec(config),
+      getApiKey: (provider) => modelApiKeys[provider],
       systemPromptMode: config.backends.pi_embedded.system_prompt_mode,
       module: config.backends.pi_embedded.module,
     });