feat: add Pi subagent scheduler and child runtime

electron/coding-runtime/pi/worker-process.ts

@@ -52,6 +52,7 @@ export type PiWorkerProcessOptions = {
   cwd: string;
   configDir: string;
   sessionDir: string;
+  tools?: readonly string[];
   additionalArgs?: readonly string[];
   env?: NodeJS.ProcessEnv;
   sensitiveValues?: readonly string[];
@@ -64,6 +65,7 @@ export type PiWorkerProcessOptions = {
 export function buildPiRpcArgs(
   sessionDir: string,
   additionalArgs: readonly string[] = [],
+  tools: readonly string[] = ['read', 'bash', 'edit', 'write', 'grep', 'find', 'ls', 'ask_user'],
 ): string[] {
   return [
     '--mode', 'rpc',
@@ -75,7 +77,7 @@ export function buildPiRpcArgs(
     '--no-themes',
     '--no-context-files',
     '--no-approve',
-    '--tools', 'read,bash,edit,write,grep,find,ls,ask_user',
+    '--tools', tools.join(','),
     ...additionalArgs,
   ];
 }
@@ -217,7 +219,11 @@ export class PiWorkerProcess {
   async start(): Promise<this> {
     if (this.child) throw new Error('Pi worker process already started');
     const generation = this.generationValue;
-    const args = buildPiRpcArgs(this.options.sessionDir, this.options.additionalArgs);
+    const args = buildPiRpcArgs(
+      this.options.sessionDir,
+      this.options.additionalArgs,
+      this.options.tools,
+    );
     assertSensitiveValuesAbsentFromArgs(args, this.options.sensitiveValues);
     const child = spawn(
       this.options.executablePath,