Rename project to Kao

- Renamed sentry.py to kao.py
- Updated all references from Sentry-Emote to Kao
- Kao (顔) means "face" in Japanese

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

CLAUDE.md

@@ -4,7 +4,7 @@ This file provides guidance to Claude Code (claude.ai/code) when working with co
 
 ## Project Overview
 
-Sentry-Emote is a minimalist system status monitor designed for an old Pixel phone used as an ambient display. It uses ASCII "emotes" to represent system health instead of complex graphs.
+Kao is a minimalist system status monitor designed for an old Pixel phone used as an ambient display. It uses ASCII "emotes" to represent system health instead of complex graphs.
 
 ## Architecture
 
@@ -20,7 +20,7 @@ Sentry-Emote is a minimalist system status monitor designed for an old Pixel pho
 - **Aggregator** (`aggregator.py`) — Flask service managing the event queue and priority logic
 - **Detectors** (`detectors/*.py`) — Independent scripts monitoring system metrics
 - **Emote-UI** (`index.html`) — OLED-optimized web frontend
-- **Sentry** (`sentry.py`) — Unified entry point managing all processes
+- **Sentry** (`kao.py`) — Unified entry point managing all processes
 
 ## Quick Start
 
@@ -28,7 +28,7 @@ Sentry-Emote is a minimalist system status monitor designed for an old Pixel pho
 python -m venv venv
 source venv/bin/activate  # or .\venv\Scripts\activate on Windows
 pip install -r requirements.txt
-python sentry.py
+python kao.py
 ```
 
 UI available at http://localhost:5000
@@ -107,7 +107,7 @@ Additional states:
 ## File Structure
 
 ```
-├── sentry.py           # Unified entry point
+├── kao.py           # Unified entry point
 ├── aggregator.py       # Event broker/API server
 ├── index.html          # OLED-optimized frontend
 ├── config.json         # Runtime configuration