feat: Task subagents: allow overriding spawned letta executable (#340)

src/agent/subagents/manager.ts

@@ -382,8 +382,10 @@ async function executeSubagent(
   try {
     const cliArgs = buildSubagentArgs(type, config, model, userPrompt);
 
-    // Spawn letta in headless mode with stream-json output
-    const proc = spawn("letta", cliArgs, {
+    // Spawn Letta Code in headless mode.
+    // Some environments may have a different `letta` binary earlier in PATH.
+    const lettaCmd = process.env.LETTA_CODE_BIN || "letta";
+    const proc = spawn(lettaCmd, cliArgs, {
       cwd: process.cwd(),
       env: process.env,
     });