fix: detect non-interactive TTY in setup wizard to prevent hang

hermes setup hung indefinitely on headless SSH sessions, Docker
containers, and CI/CD environments because the interactive provider
selection menu could not receive input.

Two-layer fix:
1. sys.stdin.isatty() check — auto-detects non-interactive environments
2. --non-interactive flag support — already in CLI parser, now honored

In both cases the wizard exits immediately with helpful guidance
pointing users to 'hermes config set' commands.

Closes #905

hermes_cli/setup.py

@@ -2338,6 +2338,28 @@ def run_setup_wizard(args):
     config = load_config()
     hermes_home = get_hermes_home()
 
+    # Detect non-interactive environments (headless SSH, Docker, CI/CD)
+    non_interactive = getattr(args, 'non_interactive', False)
+    if not non_interactive and not sys.stdin.isatty():
+        non_interactive = True
+
+    if non_interactive:
+        print()
+        print(color("⚕ Hermes Setup — Non-interactive mode", Colors.CYAN, Colors.BOLD))
+        print()
+        print_info("Running in a non-interactive environment (no TTY detected).")
+        print_info("The interactive wizard cannot be used here.")
+        print()
+        print_info("Configure Hermes using environment variables or config commands:")
+        print_info("  hermes config set model.provider custom")
+        print_info("  hermes config set model.base_url http://localhost:8080/v1")
+        print_info("  hermes config set model.default your-model-name")
+        print()
+        print_info("Or set OPENROUTER_API_KEY / OPENAI_API_KEY in your environment.")
+        print_info("Run 'hermes setup' in an interactive terminal to use the full wizard.")
+        print()
+        return
+
     # Check if a specific section was requested
     section = getattr(args, "section", None)
     if section: