fix: /config/reset now resets live globals to defaults

reset_to_defaults() previously only cleared the runtime_config dict and
saved config_runtime.yaml, but never touched the actual globals that
control runtime behavior. After a reset, LANGUAGE_MODE, AUTONOMOUS_DEBUG,
VOICE_DEBUG_MODE, USE_CHESHIRE_CAT, PREFER_AMD_GPU, and DM_MOOD all kept
their current in-memory values until the next restart.

Now reset_to_defaults() also resets the corresponding globals to their
default values from CONFIG (the static config loaded from config.yaml).
Both full reset and single-key reset are supported. The default values
come from the Pydantic AppConfig schema, ensuring consistency.

Tested: set non-default values, full reset -> all back to defaults,
single-key reset -> only that key back to default, runtime_state property
reflects the reset immediately.

bot/config_manager.py

@@ -225,9 +225,16 @@ class ConfigManager:
         """
         Reset configuration to defaults.
         
+        Clears runtime overrides from config_runtime.yaml AND resets the
+        corresponding globals to their default values so the change takes
+        effect immediately without a restart.
+        
         Args:
             key_path: Specific key to reset, or None to reset all runtime config
         """
+        import globals as g
+        from config import CONFIG
+
         if key_path:
             # Remove specific key from runtime config
             self._remove_nested_key(self.runtime_config, key_path)
@@ -239,6 +246,38 @@ class ConfigManager:
 
         self.save_runtime_config()
 
+        # ---- Reset live globals to match defaults ----
+        # Map: config_runtime key path -> (globals attr, default from CONFIG)
+        _DEFAULTS_MAP = {
+            "discord.language_mode":    ("LANGUAGE_MODE",    CONFIG.discord.language_mode),
+            "autonomous.debug_mode":    ("AUTONOMOUS_DEBUG", CONFIG.autonomous.debug_mode),
+            "voice.debug_mode":         ("VOICE_DEBUG_MODE", CONFIG.voice.debug_mode),
+            "memory.use_cheshire_cat":  ("USE_CHESHIRE_CAT", CONFIG.cheshire_cat.enabled),
+            "gpu.prefer_amd":           ("PREFER_AMD_GPU",   CONFIG.gpu.prefer_amd),
+        }
+
+        reset_items = []
+
+        if key_path:
+            # Reset only the specific global
+            if key_path in _DEFAULTS_MAP:
+                attr, default = _DEFAULTS_MAP[key_path]
+                setattr(g, attr, default)
+                reset_items.append(f"{attr}={default}")
+        else:
+            # Reset all globals to defaults
+            for kp, (attr, default) in _DEFAULTS_MAP.items():
+                setattr(g, attr, default)
+                reset_items.append(f"{attr}={default}")
+
+            # Also reset DM mood to neutral
+            g.DM_MOOD = "neutral"
+            g.DM_MOOD_DESCRIPTION = "I'm feeling neutral and balanced today."
+            reset_items.append("DM_MOOD=neutral")
+
+        if reset_items:
+            logger.info(f"🔄 Reset {len(reset_items)} globals: {', '.join(reset_items)}")
+
     def _remove_nested_key(self, config: Dict, key_path: str):
         """Remove nested key from config."""
         keys = key_path.split(".")