feat: complete evidence restructuring worktree

backend/src/pi/managed-config.ts

@@ -56,6 +56,34 @@ export function validateDeclarativePiConfig(raw: string): void {
   assertDeclarativePiConfig(parsePiConfigJson(raw));
 }
 
+/** Return the selected provider's declarative apiKey value without knowing provider IDs in code. */
+export function configuredPiProviderApiKey(
+  raw: string | undefined,
+  provider: string | undefined,
+): string | undefined {
+  if (raw === undefined || provider === undefined) return undefined;
+  const parsed = parsePiConfigJson(raw);
+  if (!parsed || typeof parsed !== "object" || Array.isArray(parsed)) {
+    throw new PiManagedConfigError();
+  }
+  const providers = (parsed as { providers?: unknown }).providers;
+  if (!providers || typeof providers !== "object" || Array.isArray(providers)) {
+    throw new PiManagedConfigError();
+  }
+  const entry = Object.entries(providers as Record<string, unknown>)
+    .find(([id]) => id.trim().toLowerCase() === provider.trim().toLowerCase());
+  if (!entry) return undefined;
+  const config = entry[1];
+  if (!config || typeof config !== "object" || Array.isArray(config)) {
+    throw new PiManagedConfigError();
+  }
+  assertDeclarativePiConfig(config);
+  const apiKey = (config as { apiKey?: unknown }).apiKey;
+  if (apiKey === undefined) return undefined;
+  if (typeof apiKey !== "string" || apiKey.length === 0) throw new PiManagedConfigError();
+  return apiKey;
+}
+
 function configuredPiAgentDir(): string {
   return resolve(process.env.PI_CODING_AGENT_DIR ?? join(homedir(), ".pi", "agent"));
 }
@@ -102,6 +130,7 @@ export function readConfiguredPiAgentFile(
 export interface PiRuntimeAgentSnapshot {
   agentDir: string;
   sessionDir: string;
+  models?: string;
   cleanup: () => void;
 }
 
@@ -152,6 +181,7 @@ export function createPiRuntimeAgentSnapshot(): PiRuntimeAgentSnapshot {
   return {
     agentDir: snapshotDir,
     sessionDir: process.env.PI_CODING_AGENT_SESSION_DIR || join(sourceAgentDir, "sessions"),
+    models,
     cleanup: () => {
       if (cleaned) return;
       cleaned = true;