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- No `default` project when `LANGSMITH_AGENT_*` env vars are set, so the env address isn't sent beside a project. - A project named in code clears the env address on the run. - `LangChainTracer` takes an `address`, filled from `ls.address(...)` tracing contexts and addressed `@traceable` parents. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>