refactor: consolidate get_hermes_home() and parse_reasoning_effort() (#3062)

Centralizes two widely-duplicated patterns into hermes_constants.py:

1. get_hermes_home() — Path resolution for ~/.hermes (HERMES_HOME env var)
   - Was copy-pasted inline across 30+ files as:
     Path(os.getenv("HERMES_HOME", Path.home() / ".hermes"))
   - Now defined once in hermes_constants.py (zero-dependency module)
   - hermes_cli/config.py re-exports it for backward compatibility
   - Removed local wrapper functions in honcho_integration/client.py,
     tools/website_policy.py, tools/tirith_security.py, hermes_cli/uninstall.py

2. parse_reasoning_effort() — Reasoning effort string validation
   - Was copy-pasted in cli.py, gateway/run.py, cron/scheduler.py
   - Same validation logic: check against (xhigh, high, medium, low, minimal, none)
   - Now defined once in hermes_constants.py, called from all 3 locations
   - Warning log for unknown values kept at call sites (context-specific)

31 files changed, net +31 lines (125 insertions, 94 deletions)
Full test suite: 6179 passed, 0 failed

acp_adapter/entry.py

@@ -18,6 +18,7 @@ import logging
 import os
 import sys
 from pathlib import Path
+from hermes_constants import get_hermes_home
 
 
 def _setup_logging() -> None:
@@ -44,7 +45,7 @@ def _load_env() -> None:
     """Load .env from HERMES_HOME (default ``~/.hermes``)."""
     from hermes_cli.env_loader import load_hermes_dotenv
 
-    hermes_home = Path(os.getenv("HERMES_HOME", Path.home() / ".hermes"))
+    hermes_home = get_hermes_home()
     loaded = load_hermes_dotenv(hermes_home=hermes_home)
     if loaded:
         for env_file in loaded:

acp_adapter/session.py

@@ -8,6 +8,8 @@ history.
 """
 from __future__ import annotations
 
+from hermes_constants import get_hermes_home
+
 import copy
 import json
 import logging
@@ -251,7 +253,7 @@ class SessionManager:
             import os
             from pathlib import Path
             from hermes_state import SessionDB
-            hermes_home = Path(os.getenv("HERMES_HOME", Path.home() / ".hermes"))
+            hermes_home = get_hermes_home()
             self._db_instance = SessionDB(db_path=hermes_home / "state.db")
             return self._db_instance
         except Exception: