Bump to v1.5.0: deduplicate detectors, fix aggregator bugs, fix blocking I/O

- Extract shared send_event/clear_event into detectors/base.py, removing
  ~150 lines of duplication across all 6 detectors
- Fix default aggregator URL from port 5000 to 5100 in all detectors
- Standardize cpu.py and memory.py to use active_alerts set pattern
- Fix immediate emote rotation on startup (last_emote_change = time.time())
- Extract magic numbers to named constants in aggregator
- Protect write_status() with try/except OSError
- Fix notify event ID collision with monotonic counter
- Replace blocking stream_output() with background daemon threads in kao.py

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

aggregator.py

@@ -19,6 +19,9 @@ ROOT_DIR = Path(__file__).parent
 STATUS_FILE = Path(__file__).parent / "status.json"
 DEFAULT_NOTIFY_TTL = 10  # Default TTL for Priority 3 (Notify) events
 CELEBRATION_DURATION = 5  # Seconds to show celebration after recovery
+EMOTE_ROTATION_INTERVAL = 300  # Seconds between emote rotations
+IDLE_EXPRESSION_CHANCE = 0.15  # Chance of a brief blink/wink on rotation
+DEFAULT_NOTIFY_DURATION = 5  # Default duration for /notify events
 
 # Emote variations with paired animations
 OPTIMAL_EMOTES = [
@@ -53,10 +56,13 @@ celebrating_until = 0
 blinking_until = 0
 blink_emote = None
 blink_animation = None
-last_emote_change = 0
+last_emote_change = time.time()
 current_optimal_emote = OPTIMAL_EMOTES[0][0]
 current_optimal_animation = OPTIMAL_EMOTES[0][1]
 
+# Notify counter for unique IDs
+_notify_counter = 0
+
 # Sleep mode
 is_sleeping = False
 SLEEP_EMOTE = "( -_-)zzZ"
@@ -134,11 +140,11 @@ def get_current_state():
             animation = blink_animation
         else:
             # Rotate optimal emotes every 5 minutes
-            if now - last_emote_change > 300:
+            if now - last_emote_change > EMOTE_ROTATION_INTERVAL:
                 last_emote_change = now
                 current_optimal_emote, current_optimal_animation = random.choice(OPTIMAL_EMOTES)
-                # 15% chance of a brief blink/wink
-                if random.random() < 0.15:
+                # Brief blink/wink chance on rotation
+                if random.random() < IDLE_EXPRESSION_CHANCE:
                     blink_emote, blink_animation = random.choice(IDLE_EMOTES)
                     blinking_until = now + random.uniform(1, 2)
             emote = current_optimal_emote
@@ -163,8 +169,11 @@ def get_current_state():
 def write_status():
     """Write current state to status.json."""
     state = get_current_state()
-    with open(STATUS_FILE, "w") as f:
-        json.dump(state, f, indent="\t")
+    try:
+        with open(STATUS_FILE, "w") as f:
+            json.dump(state, f, indent="\t")
+    except OSError as e:
+        print(f"[ERROR] Failed to write status file: {e}")
     return state
 
 
@@ -272,12 +281,14 @@ def notify():
         "sound": "chime"        # optional: chime, alert, warning, critical, success, none
     }
     """
+    global _notify_counter
     data = request.get_json(force=True) if request.data else {}
     message = data.get("message", "")
-    duration = int(data.get("duration", 5))
+    duration = int(data.get("duration", DEFAULT_NOTIFY_DURATION))
 
     # Generate unique ID to avoid conflicts
-    event_id = f"ha_notify_{int(time.time() * 1000)}"
+    _notify_counter += 1
+    event_id = f"notify_{int(time.time())}_{_notify_counter}"
 
     event = {
         "priority": 3,  # Notify priority