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- Add X-Content-Type-Options, X-Frame-Options, and Referrer-Policy headers to all responses - Cap express.json() body to 50kb to prevent memory exhaustion via large payloads - Redact credentials from MQTT broker URL before logging (ws://user:pass@host pattern) - Whitelist telemetry event kind field instead of accepting arbitrary strings Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>