chore: relay v2 cleanup — remove f-strings, add version/mode to health endpoint

hermes_client.py

@@ -67,13 +67,13 @@ def _ensure_hermes_loaded():
 
     elapsed = time.time() - start
     logger.info(
-        f"Hermes loaded in {elapsed:.2f}s "
-        f"(toolsets: {toolsets})"
+        "Hermes loaded in %.2fs (toolsets: %s)",
+        elapsed, toolsets
     )
     _HERMES_LOADED = True
 
 
-def call_hermes(prompt: str) -> str:
+def call_hermes(prompt):
     """
     Roep Hermes aan — hergebruikt een warme agent.
 
@@ -85,7 +85,7 @@ def call_hermes(prompt: str) -> str:
 
     # Prefix (zoals /fast)
     prefix = os.environ.get('HERMES_RELAY_PREFIX', '/fast')
-    full_prompt = f"{prefix} {prompt}".strip() if prefix else prompt
+    full_prompt = (prefix + " " + prompt).strip() if prefix else prompt
 
     start = time.time()
 
@@ -122,10 +122,10 @@ def call_hermes(prompt: str) -> str:
         logger.warning("Hermes riep sys.exit() aan tijdens query")
         result = stdout_capture.getvalue().strip()
     except Exception as e:
-        logger.error(f"Hermes error: {e}", exc_info=True)
-        return f"⚠️ Hermes error: {e}"
+        logger.error("Hermes error: %s", e, exc_info=True)
+        return "⚠️ Hermes error: " + str(e)
 
     elapsed = time.time() - start
-    logger.info(f"Hermes responded in {elapsed:.1f}s ({len(result)} chars)")
+    logger.info("Hermes responded in %.1fs (%d chars)", elapsed, len(result))
 
     return result