fix(cli): restore PATH handling on Windows and fix PowerShell quoting (#785)

Co-Authored-By: Aaron Matthis <rapus95@users.noreply.github.com>
Co-Authored-By: Letta <noreply@letta.com>

src/tools/impl/shellEnv.ts

@@ -54,8 +54,11 @@ export function getShellEnv(): NodeJS.ProcessEnv {
   // Add ripgrep bin directory to PATH if available
   const rgBinDir = getRipgrepBinDir();
   if (rgBinDir) {
-    const currentPath = env.PATH || "";
-    env.PATH = `${rgBinDir}${path.delimiter}${currentPath}`;
+    // Windows uses "Path" (not "PATH"), and env vars are case-insensitive there.
+    // Find the actual key to avoid clobbering the user's PATH.
+    const pathKey =
+      Object.keys(env).find((k) => k.toUpperCase() === "PATH") || "PATH";
+    env[pathKey] = `${rgBinDir}${path.delimiter}${env[pathKey] || ""}`;
   }
 
   // Add Letta context for skill scripts