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>

README.md

@@ -177,7 +177,7 @@ automation:
 - `emote`: Any ASCII emote (e.g., `( °o°)`, `\\(^o^)/`)
 - `color`: Hex color (e.g., `#FF9900`)
 - `animation`: `breathing`, `shaking`, `popping`, `celebrating`, `floating`, `bouncing`, `swaying`
-- `sound`: `chime`, `alert`, `warning`, `critical`, `success`, `notify`, `none`
+- `sound`: `chime`, `alert`, `warning`, `critical`, `success`, `notify`, `doorbell`, `knock`, `ding`, `blip`, `siren`, `tada`, `ping`, `bubble`, `fanfare`, `alarm`, `none`
 
 ## API Reference
 
@@ -200,8 +200,8 @@ Full API documentation available at [/docs](http://localhost:5100/docs) or in [o
 
 The emote has personality! In optimal state it:
 
-- Rotates through happy faces every 5 minutes
-- Occasionally winks `( -_^)` or blinks `( ᵕ.ᵕ)` for a second or two
+- Shows a stable face all day — set fresh each morning when `/wake` is called
+- Occasionally winks `( -_^)` or blinks `( ᵕ.ᵕ)` for a second or two on wake
 - Celebrates `\(^o^)/` when recovering from warnings
 - Each face has its own animation (floating, bouncing, swaying)
 - Reacts when tapped `( °o°)`, shows version info, and dismisses active alerts
@@ -211,6 +211,7 @@ The emote has personality! In optimal state it:
 - Critical: urgent descending tone
 - Notify: gentle ping
 - Recovery: happy ascending chirp
+- 10 additional synthesized sounds for `/notify`: `doorbell`, `knock`, `ding`, `blip`, `siren`, `tada`, `ping`, `bubble`, `fanfare`, `alarm` (alarm loops until tapped)
 
 ## License