feat(M3): Direct Execution

tools/ai-cli-dispatch/src/execute.ts

@@ -1,4 +1,6 @@
+import type { ChildProcess } from "node:child_process";
 import { spawn as defaultSpawn } from "node:child_process";
+import type { PathLike } from "node:fs";
 import { existsSync as defaultExistsSync } from "node:fs";
 import type { ClientName, ExecResult } from "./types.js";
 import { ClientNotFoundError, ExecError } from "./types.js";
@@ -12,8 +14,8 @@ const CLIENT_ARGS: Record<ClientName, (prompt: string) => string[]> = {
 export interface ExecuteOptions {
   clientPath?: string;
   timeoutMs?: number;
-  spawn?: typeof defaultSpawn;
-  existsSync?: typeof defaultExistsSync;
+  spawn?: (command: string, args: string[], options?: { shell?: boolean }) => ChildProcess;
+  existsSync?: (path: PathLike) => boolean;
 }
 
 export async function executePrompt(
@@ -38,7 +40,15 @@ export async function executePrompt(
     throw new ClientNotFoundError(client);
   }
 
-  const args = CLIENT_ARGS[client](prompt);
+  const argBuilder = (CLIENT_ARGS as Record<string, (prompt: string) => string[]>)[client];
+  if (!argBuilder) {
+    throw new ExecError(`Unknown client: ${client}`, {
+      stdout: "",
+      stderr: "",
+      exitCode: -1,
+    });
+  }
+  const args = argBuilder(prompt);
 
   return new Promise((resolve, reject) => {
     let settled = false;