mirrord 3.243.0 Enables guard_std_fds by Default and Fixes a 50ms Stall on Stolen HTTP Requests

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mirrord, which runs a local process or an AI agent's environment as if it were a pod in your Kubernetes cluster with real env vars, DNS, and network, shipped 3.243.0 on 2026-07-31. experimental.guard_std_fds is now on by default in the OSS build. Two fixes matter for agent-driven local development: stolen HTTP requests no longer wait out a 50ms retry backoff on connections the local app already closed (connections were cached without checking liveness), and getaddrinfo calls passing AI_NUMERICHOST are no longer resolved remotely, which had made every hostname report as a literal address.