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Rename the default config filename from `langgraph.json` to `langsmith.json` as part of the "LangGraph Platform" to "LangSmith Deployment" rebranding. Backward compatibility is preserved: the CLI falls back to `langgraph.json` with a deprecation warning when `langsmith.json` is not found. A new `_resolve_config` callback handles the resolution logic for all `--config` click options. Changes span libs/cli (core logic, examples, tests), libs/sdk-py (docstrings), libs/langgraph (Makefile), and .github CI scripts. Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>