Tip: Claude Code Now Writes `[claude-code:unrecognized_model]` to stderr When You Pin a Model ID It Doesn't Know

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Print mode (`-p`) gained a diagnostic: when a request goes out for a model ID Claude Code doesn't recognize, it emits a `[claude-code:unrecognized_model]` line to stderr, and you silence it by mapping the ID with `modelOverrides`. This is directly useful for anyone running headless pipelines against a pinned or proxied model name — previously an unrecognized ID failed silently or fell back without telling you, which is exactly the failure mode that makes a scheduled run quietly degrade for weeks before anyone notices.