fix(skills): factor HERMES_HOME resolution into shared _hermes_home helper

The three google-workspace scripts (setup.py, google_api.py, gws_bridge.py)
each had their own way of resolving HERMES_HOME:

- setup.py imported hermes_constants (crashes outside Hermes process)
- google_api.py used os.getenv inline (no strip, no empty handling)
- gws_bridge.py defined its own local get_hermes_home() (duplicate)

Extract the common logic into _hermes_home.py which:
- Delegates to hermes_constants when available (profile support, etc.)
- Falls back to os.getenv with .strip() + empty-as-unset handling
- Provides display_hermes_home() with ~/ shortening for profiles

All three scripts now import from _hermes_home instead of duplicating.

7 regression tests cover the fallback path: env var override, default
~/.hermes, empty env var, display shortening, profile paths, and
custom non-home paths.

Closes #12722

skills/productivity/google-workspace/scripts/_hermes_home.py

@@ -0,0 +1,42 @@
+"""Resolve HERMES_HOME for standalone skill scripts.
+
+Skill scripts may run outside the Hermes process (e.g. system Python,
+nix env, CI) where ``hermes_constants`` is not importable.  This module
+provides the same ``get_hermes_home()`` and ``display_hermes_home()``
+contracts as ``hermes_constants`` without requiring it on ``sys.path``.
+
+When ``hermes_constants`` IS available it is used directly so that any
+future enhancements (profile resolution, Docker detection, etc.) are
+picked up automatically.  The fallback path replicates the core logic
+from ``hermes_constants.py`` using only the stdlib.
+
+All scripts under ``google-workspace/scripts/`` should import from here
+instead of duplicating the ``HERMES_HOME = Path(os.getenv(...))`` pattern.
+"""
+
+from __future__ import annotations
+
+import os
+from pathlib import Path
+
+try:
+    from hermes_constants import display_hermes_home as display_hermes_home
+    from hermes_constants import get_hermes_home as get_hermes_home
+except (ModuleNotFoundError, ImportError):
+
+    def get_hermes_home() -> Path:
+        """Return the Hermes home directory (default: ~/.hermes).
+
+        Mirrors ``hermes_constants.get_hermes_home()``."""
+        val = os.environ.get("HERMES_HOME", "").strip()
+        return Path(val) if val else Path.home() / ".hermes"
+
+    def display_hermes_home() -> str:
+        """Return a user-friendly ``~/``-shortened display string.
+
+        Mirrors ``hermes_constants.display_hermes_home()``."""
+        home = get_hermes_home()
+        try:
+            return "~/" + str(home.relative_to(Path.home()))
+        except ValueError:
+            return str(home)

skills/productivity/google-workspace/scripts/google_api.py

@@ -31,7 +31,14 @@ from datetime import datetime, timedelta, timezone
 from email.mime.text import MIMEText
 from pathlib import Path
 
-HERMES_HOME = Path(os.getenv("HERMES_HOME", Path.home() / ".hermes"))
+# Ensure sibling modules (_hermes_home) are importable when run standalone.
+_SCRIPTS_DIR = str(Path(__file__).resolve().parent)
+if _SCRIPTS_DIR not in sys.path:
+    sys.path.insert(0, _SCRIPTS_DIR)
+
+from _hermes_home import get_hermes_home
+
+HERMES_HOME = get_hermes_home()
 TOKEN_PATH = HERMES_HOME / "google_token.json"
 CLIENT_SECRET_PATH = HERMES_HOME / "google_client_secret.json"
 

skills/productivity/google-workspace/scripts/gws_bridge.py

@@ -10,9 +10,12 @@ import sys
 from datetime import datetime, timezone
 from pathlib import Path
 
+# Ensure sibling modules (_hermes_home) are importable when run standalone.
+_SCRIPTS_DIR = str(Path(__file__).resolve().parent)
+if _SCRIPTS_DIR not in sys.path:
+    sys.path.insert(0, _SCRIPTS_DIR)
 
-def get_hermes_home() -> Path:
-    return Path(os.environ.get("HERMES_HOME", Path.home() / ".hermes"))
+from _hermes_home import get_hermes_home
 
 
 def get_token_path() -> Path:

skills/productivity/google-workspace/scripts/setup.py

@@ -28,13 +28,12 @@ import subprocess
 import sys
 from pathlib import Path
 
-try:
-    from hermes_constants import display_hermes_home, get_hermes_home
-except ModuleNotFoundError:
-    HERMES_AGENT_ROOT = Path(__file__).resolve().parents[4]
-    if HERMES_AGENT_ROOT.exists():
-        sys.path.insert(0, str(HERMES_AGENT_ROOT))
-    from hermes_constants import display_hermes_home, get_hermes_home
+# Ensure sibling modules (_hermes_home) are importable when run standalone.
+_SCRIPTS_DIR = str(Path(__file__).resolve().parent)
+if _SCRIPTS_DIR not in sys.path:
+    sys.path.insert(0, _SCRIPTS_DIR)
+
+from _hermes_home import display_hermes_home, get_hermes_home
 
 HERMES_HOME = get_hermes_home()
 TOKEN_PATH = HERMES_HOME / "google_token.json"