fix(P3): 3 priority-3 fixes — timezone, decay rounding, rate limiter

#16  Timezone consistency — added TZ=Europe/Sofia to docker-compose.yml
     so datetime.now() returns local time inside the container. Removed
     the +3 hour hack from get_time_of_day(). All three time-of-day
     consumers (autonomous_v1_legacy, moods, autonomous_engine) now
     use the same correct local hour automatically.

#17  Decay truncation — replaced int() with round() in decay_events()
     so a counter of 1 survives one more 15-minute cycle instead of
     being immediately zeroed (round(0.841)=1 vs int(0.841)=0).

#20  Unpersisted rate limiter — _last_action_execution dict in
     autonomous.py is now seeded from the engine's persisted
     server_last_action on import, so restarts don't bypass the
     30-second cooldown.

Note: #18 (dead config fields) was a false positive — autonomous_interval_minutes
IS used by the scheduler. #19 deferred to bipolar mode rework.

bot/utils/autonomous.py

@@ -15,7 +15,8 @@ from utils.task_tracker import create_tracked_task
 logger = get_logger('autonomous')
 
 # Rate limiting: Track last action time per server to prevent rapid-fire
-_last_action_execution = {}  # guild_id -> timestamp
+# Seeded from persisted engine data so restarts don't bypass cooldowns
+_last_action_execution = dict(autonomous_engine.server_last_action)
 _MIN_ACTION_INTERVAL = 30  # Minimum 30 seconds between autonomous actions
 
 # Per-guild locks to prevent race conditions from near-simultaneous messages