feat: add Confluence recent pages + Sentry error tracking (MAT-58, MAT-59)

MAT-58: Add recent_confluence_pages tool to both voice and text chat.
Shows last 5 recently modified pages so users can pick directly
instead of having to search every time.

MAT-59: Integrate sentry-sdk in all three entry points (agent.py,
bot.py, voice.py). SENTRY_DSN env var, traces at 10% sample rate.
Requires creating project in Sentry UI and setting DSN.

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

docker-compose.yml

@@ -7,6 +7,8 @@ services:
     env_file: .env
     restart: unless-stopped
     network_mode: host
+    environment:
+      - SENTRY_DSN
 
   bot:
     build:
@@ -24,6 +26,7 @@ services:
       - MEMORY_SERVICE_URL=http://memory-service:8090
       - PORTAL_URL
       - BOT_API_KEY
+      - SENTRY_DSN
     volumes:
       - bot-data:/data
     depends_on: