• Merge pull request #835 from kaitranntt/kai/fix/834-docker-cliproxy-detection
• test(docker): add tests for health check port detection and ETXTBSY guard
• fix(docker): wrap session registration in try-catch and narrow ETXTBSY guard
• fix(docker): address review findings — PID guard, deleteBinary guard, blocked fallback
• fix(cliproxy): guard binary install against ETXTBSY when running
• fix(docker): register session lock from bootstrap for proxy discovery
• fix(docker): use HTTP-first proxy detection in health checks