fix(desktop): use augmented PATH for model discovery subprocess

desktop/src-tauri/src/commands/agent_model_process.rs

@@ -27,7 +27,13 @@ pub(super) async fn run_agent_models_command(
         if let Some(home) = default_agent_workdir() {
             cmd.current_dir(home);
         }
-        if let Some(ref path) = crate::managed_agents::login_shell_path() {
+        // Inject the same augmented PATH used for launched agents and CLI
+        // probes: managed Node/npm dirs, exe-parent sidecars, login-shell
+        // PATH, and (Windows) the inherited process PATH. login_shell_path()
+        // alone is always None on Windows, which left this child with no
+        // managed Node dirs — the ACP adapter's `.cmd` shims then failed with
+        // `'node' is not recognized` and the model dropdown stayed empty.
+        if let Some(ref path) = crate::managed_agents::readiness::cli_probe::augmented_path() {
             cmd.env("PATH", path);
         }
         cmd.arg("models")

desktop/src-tauri/src/managed_agents/readiness/cli_probe.rs

@@ -2,8 +2,10 @@ use std::path::Path;
 
 use crate::managed_agents::runtime::build_augmented_path;
 
-/// Build the augmented PATH for CLI probes, including nvm's default Node.js
-/// bin directory so `#!/usr/bin/env node` shims (e.g. codex-acp) resolve.
+/// Build the augmented PATH for CLI probes and other native child processes
+/// (auth commands, `buzz-acp models` discovery), including nvm's default
+/// Node.js bin directory so `#!/usr/bin/env node` shims (e.g. codex-acp)
+/// resolve.
 pub(crate) fn augmented_path() -> Option<String> {
     let home = dirs::home_dir();
     let nvm_bin = home