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

hermes_constants.py

@@ -4,6 +4,40 @@ Import-safe module with no dependencies — can be imported from anywhere
 without risk of circular imports.
 """
 
+import os
+from pathlib import Path
+
+
+def get_hermes_home() -> Path:
+    """Return the Hermes home directory (default: ~/.hermes).
+
+    Reads HERMES_HOME env var, falls back to ~/.hermes.
+    This is the single source of truth — all other copies should import this.
+    """
+    return Path(os.getenv("HERMES_HOME", Path.home() / ".hermes"))
+
+
+VALID_REASONING_EFFORTS = ("xhigh", "high", "medium", "low", "minimal")
+
+
+def parse_reasoning_effort(effort: str) -> dict | None:
+    """Parse a reasoning effort level into a config dict.
+
+    Valid levels: "xhigh", "high", "medium", "low", "minimal", "none".
+    Returns None when the input is empty or unrecognized (caller uses default).
+    Returns {"enabled": False} for "none".
+    Returns {"enabled": True, "effort": <level>} for valid effort levels.
+    """
+    if not effort or not effort.strip():
+        return None
+    effort = effort.strip().lower()
+    if effort == "none":
+        return {"enabled": False}
+    if effort in VALID_REASONING_EFFORTS:
+        return {"enabled": True, "effort": effort}
+    return None
+
+
 OPENROUTER_BASE_URL = "https://openrouter.ai/api/v1"
 OPENROUTER_MODELS_URL = f"{OPENROUTER_BASE_URL}/models"
 OPENROUTER_CHAT_URL = f"{OPENROUTER_BASE_URL}/chat/completions"