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>

requirements.txt

@@ -1,14 +1,14 @@
-blinker==1.9.0
-certifi==2026.1.4
-charset-normalizer==3.4.4
-click==8.3.1
-colorama==0.4.6
-Flask==3.1.2
-idna==3.11
-itsdangerous==2.2.0
-Jinja2==3.1.6
-MarkupSafe==3.0.3
-psutil==7.2.2
-requests==2.32.5
-urllib3==2.6.3
-Werkzeug==3.1.5
+blinker==1.9.0
+certifi==2026.1.4
+charset-normalizer==3.4.4
+click==8.3.1
+colorama==0.4.6
+Flask==3.1.2
+idna==3.11
+itsdangerous==2.2.0
+Jinja2==3.1.6
+MarkupSafe==3.0.3
+psutil==7.2.2
+requests==2.32.5
+urllib3==2.6.3
+Werkzeug==3.1.5