Bump to v2.2.0: fix warning/bubble sounds, add klaxon, refresh docs

- index.html: fix playWarningSound (440→550 Hz, louder), fix playBubbleSound
  (audible volumes/durations), add looping klaxon sound (sawtooth wah-wah),
  stopKlaxon() on tap and state clear, bump VERSION to v2.2.0
- kao_tui.py: add klaxon to SOUNDS list, drop notify duration 5→2s for
  faster iteration; also include improved post() error reporting
- CLAUDE.md: add kao_tui.py to file structure, fix personality table
  (remove ˙▿˙ row not in aggregator), add klaxon to sound list
- README.md: add klaxon to sound list, update counts
- openapi.yaml: bump version to 2.2.0, add klaxon to sound enum

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

openapi.yaml

@@ -14,7 +14,7 @@ info:
     ## TTL/Heartbeat Pattern
     Events can have a TTL (time-to-live) that auto-expires them. Detectors typically send
     heartbeat events that expire if not refreshed, indicating loss of communication.
-  version: 1.5.0
+  version: 2.2.0
   license:
     name: MIT
 
@@ -323,6 +323,7 @@ components:
             - bubble
             - fanfare
             - alarm
+            - klaxon
             - none
           example: "chime"