Bump to v2.0.0: daily emote rotation + expanded sound library

- Emote face is now stable all day; /wake picks a fresh random face each
  morning instead of rotating every 5 minutes. Removes EMOTE_ROTATION_INTERVAL
  and last_emote_change entirely.
- Added 10 new synthesized sounds for /notify: doorbell, knock, ding, blip,
  siren, tada, ping, bubble, fanfare, and alarm (loops until tapped or TTL
  expires). stopAlarm() wired into tap handler and handleStateChange().
- openapi.yaml: new sound names added to enum.
- CLAUDE.md / README.md updated to reflect both changes.

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

CLAUDE.md

@@ -103,7 +103,7 @@ All detectors support: `AGGREGATOR_URL`, `CHECK_INTERVAL`, `THRESHOLD_WARNING`,
 | `emote` | No | Custom emote to display |
 | `color` | No | Custom color (hex, e.g., `#FF9900`) |
 | `animation` | No | One of: `breathing`, `shaking`, `popping`, `celebrating`, `floating`, `bouncing`, `swaying` |
-| `sound` | No | One of: `chime`, `alert`, `warning`, `critical`, `success`, `notify`, `none` |
+| `sound` | No | One of: `chime`, `alert`, `warning`, `critical`, `success`, `notify`, `doorbell`, `knock`, `ding`, `blip`, `siren`, `tada`, `ping`, `bubble`, `fanfare`, `alarm`, `none` |
 
 ## Priority System
 
@@ -118,7 +118,7 @@ Lower number = higher priority. Events with a `ttl` auto-expire (heartbeat patte
 
 ## Personality System
 
-The optimal state cycles through emotes with paired animations every 5 minutes:
+The optimal state face is set once per day on `/wake` (random pick). Each morning a fresh emote is chosen:
 
 | Emote | Animation | Vibe |
 |-------|-----------|------|