fix: make display_hermes_home imports lazy to prevent ImportError during hermes update (#3776)

When a user runs 'hermes update', the Python process caches old modules
in sys.modules.  After git pull updates files on disk, lazy imports of
newly-updated modules fail because they try to import display_hermes_home
from the cached (old) hermes_constants which doesn't have the function.

This specifically broke the gateway auto-restart in cmd_update — importing
hermes_cli/gateway.py triggered the top-level 'from hermes_constants
import display_hermes_home' against the cached old module.  The ImportError
was silently caught, so the gateway was never restarted after update.

Users with a running gateway then hit the ImportError on their next
Telegram/Discord message when the stale gateway process lazily loaded
run_agent.py (new version) which also had the top-level import.

Fixes:
- hermes_cli/gateway.py: lazy import at call site (line 940)
- run_agent.py: lazy import at call site (line 6927)
- tools/terminal_tool.py: lazy imports at 3 call sites
- tools/tts_tool.py: static schema string (no module-level call)
- hermes_cli/auth.py: lazy import at call site (line 2024)
- hermes_cli/main.py: reload hermes_constants after git pull in cmd_update

Also fixes 4 pre-existing test failures in test_parse_env_var caused by
NameError on display_hermes_home in terminal_tool.py.

hermes_cli/auth.py

@@ -38,7 +38,7 @@ import httpx
 import yaml
 
 from hermes_cli.config import get_hermes_home, get_config_path
-from hermes_constants import OPENROUTER_BASE_URL, display_hermes_home
+from hermes_constants import OPENROUTER_BASE_URL
 
 logger = logging.getLogger(__name__)
 
@@ -2021,7 +2021,8 @@ def _login_openai_codex(args, pconfig: ProviderConfig) -> None:
     config_path = _update_config_for_provider("openai-codex", creds.get("base_url", DEFAULT_CODEX_BASE_URL))
     print()
     print("Login successful!")
-    print(f"  Auth state: {display_hermes_home()}/auth.json")
+    from hermes_constants import display_hermes_home as _dhh
+    print(f"  Auth state: {_dhh()}/auth.json")
     print(f"  Config updated: {config_path} (model.provider=openai-codex)")
 
 

hermes_cli/gateway.py

@@ -15,7 +15,8 @@ from pathlib import Path
 PROJECT_ROOT = Path(__file__).parent.parent.resolve()
 
 from hermes_cli.config import get_env_value, get_hermes_home, save_env_value, is_managed, managed_error
-from hermes_constants import display_hermes_home
+# display_hermes_home is imported lazily at call sites to avoid ImportError
+# when hermes_constants is cached from a pre-update version during `hermes update`.
 from hermes_cli.setup import (
     print_header, print_info, print_success, print_warning, print_error,
     prompt, prompt_choice, prompt_yes_no,
@@ -936,7 +937,8 @@ def launchd_install(force: bool = False):
     print()
     print("Next steps:")
     print("  hermes gateway status             # Check status")
-    print(f"  tail -f {display_hermes_home()}/logs/gateway.log  # View logs")
+    from hermes_constants import display_hermes_home as _dhh
+    print(f"  tail -f {_dhh()}/logs/gateway.log  # View logs")
 
 def launchd_uninstall():
     plist_path = get_launchd_plist_path()

hermes_cli/main.py

@@ -2971,6 +2971,17 @@ def cmd_update(args):
         print()
         print("✓ Code updated!")
         
+        # After git pull, source files on disk are newer than cached Python
+        # modules in this process.  Reload hermes_constants so that any lazy
+        # import executed below (skills sync, gateway restart) sees new
+        # attributes like display_hermes_home() added since the last release.
+        try:
+            import importlib
+            import hermes_constants as _hc
+            importlib.reload(_hc)
+        except Exception:
+            pass  # non-fatal — worst case a lazy import fails gracefully
+        
         # Sync bundled skills (copies new, updates changed, respects user deletions)
         try:
             from tools.skills_sync import sync_skills

hermes_cli/setup.py

@@ -289,7 +289,7 @@ from hermes_cli.config import (
     get_env_value,
     ensure_hermes_home,
 )
-from hermes_constants import display_hermes_home
+# display_hermes_home imported lazily at call sites (stale-module safety during hermes update)
 
 from hermes_cli.colors import Colors, color
 
@@ -684,7 +684,8 @@ def _print_setup_summary(config: dict, hermes_home):
         print_warning(
             "Some tools are disabled. Run 'hermes setup tools' to configure them,"
         )
-        print_warning(f"or edit {display_hermes_home()}/.env directly to add the missing API keys.")
+        from hermes_constants import display_hermes_home as _dhh
+        print_warning(f"or edit {_dhh()}/.env directly to add the missing API keys.")
         print()
 
     # Done banner
@@ -707,7 +708,8 @@ def _print_setup_summary(config: dict, hermes_home):
     print()
 
     # Show file locations prominently
-    print(color(f"📁 All your files are in {display_hermes_home()}/:", Colors.CYAN, Colors.BOLD))
+    from hermes_constants import display_hermes_home as _dhh
+    print(color(f"📁 All your files are in {_dhh()}/:", Colors.CYAN, Colors.BOLD))
     print()
     print(f"   {color('Settings:', Colors.YELLOW)}  {get_config_path()}")
     print(f"   {color('API Keys:', Colors.YELLOW)}  {get_env_path()}")
@@ -2838,7 +2840,8 @@ def setup_gateway(config: dict):
         save_env_value("WEBHOOK_ENABLED", "true")
         print()
         print_success("Webhooks enabled! Next steps:")
-        print_info(f"   1. Define webhook routes in {display_hermes_home()}/config.yaml")
+        from hermes_constants import display_hermes_home as _dhh
+        print_info(f"   1. Define webhook routes in {_dhh()}/config.yaml")
         print_info("   2. Point your service (GitHub, GitLab, etc.) at:")
         print_info("      http://your-server:8644/webhooks/<route-name>")
         print()