fix(P1): 6 priority-1 bug fixes for autonomous engine and mood system

#4  Sleep/mood desync — set_server_mood() now clears is_sleeping when
    mood changes away from 'asleep', preventing ghost-sleep state.

#5  Race condition in _check_and_act — added per-guild asyncio.Lock so
    overlapping ticks + message-triggered calls cannot fire concurrently.

#6  Class-level attrs on ServerConfig — sleepy_responses_left,
    angry_wakeup_timer, and forced_angry_until are now proper dataclass
    fields with defaults, so asdict()/from_dict() round-trip correctly.
    Also strips unknown keys in from_dict() to survive schema changes.

#7  Persistence decay_factor crash — initialise decay_factor = 1.0
    before the loop so empty-server or zero-downtime paths don't
    raise NameError.

#8  Double record_action — removed the redundant call in
    autonomous_tick_v2(); only _check_and_act records the action now.

#9  Engine mood desync — on_mood_change() is now called inside
    set_server_mood() (single source of truth) and removed from 4
    call-sites in api.py, moods.py, and server_manager wakeup task.

bot/utils/moods.py

@@ -270,7 +270,7 @@ async def rotate_server_mood(guild_id: int):
         
         # Check for forced angry mode and clear if expired
         if server_config.forced_angry_until:
-            now = datetime.datetime.utcnow()
+            now = datetime.datetime.utcnow().isoformat()
             if now < server_config.forced_angry_until: return
             else: server_config.forced_angry_until = None
 
@@ -292,13 +292,6 @@ async def rotate_server_mood(guild_id: int):
 
         server_manager.set_server_mood(guild_id, new_mood_name, load_mood_description(new_mood_name))
         
-        # V2: Notify autonomous engine of mood change
-        try:
-            from utils.autonomous import on_mood_change
-            on_mood_change(guild_id, new_mood_name)
-        except Exception as mood_notify_error:
-            logger.error(f"Failed to notify autonomous engine of mood change: {mood_notify_error}")
-        
         # If transitioning to asleep, set up auto-wake via centralized registry
         if new_mood_name == "asleep":
             server_manager.set_server_sleep_state(guild_id, True)