Replace fmt.Printf / log.Printf calls in loop, config, crypto, and security
logger with TeeLogger.Info/Warning/Error. Buffer is persisted to events_buffer.json
and flushed to the server after each check-in. CRITICAL security events still
write to disk immediately then also enter the buffer for server delivery.
SecurityLogger.GetBatch() no longer falls through on CRITICAL before buffering.
c1040f413b