chore: import upstream snapshot with attribution

2026-07-13 12:37:18 +08:00
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+Fixes #
+
+<!-- Replace everything above this line with a 1-2 sentence description of your change. Keep the "Fixes #xx" keyword and update the issue number. -->
+
+Read the full contributing guidelines: https://docs.langchain.com/oss/python/contributing/overview
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+> **All contributions must be in English.** See the [language policy](https://docs.langchain.com/oss/python/contributing/overview#language-policy).
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+If you paste a large clearly AI generated description here your PR may be IGNORED or CLOSED!
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+Thank you for contributing to LangGraph! Follow these steps to have your pull request considered as ready for review.
+
+1. PR title: Should follow the format: TYPE(SCOPE): DESCRIPTION
+
+    - feat(langgraph): add multi-tenant support
+  - Allowed TYPE and SCOPE values: https://github.com/langchain-ai/langgraph/blob/main/.github/workflows/pr_lint.yml#L19-L43
+
+2. PR description:
+
+  - Write 1-2 sentences summarizing the change.
+  - The `Fixes #xx` line at the top is **required** for external contributions — update the issue number and keep the keyword. This links your PR to the approved issue and auto-closes it on merge.
+  - If there are any breaking changes, please clearly describe them.
+  - If this PR depends on another PR being merged first, please include "Depends on #PR_NUMBER" in the description.
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+3. Run `make format`, `make lint` and `make test` from the root of the package(s) you've modified.
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+  - We will not consider a PR unless these three are passing in CI.
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+4. How did you verify your code works?
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+Additional guidelines:
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+  - All external PRs must link to an issue or discussion where a solution has been approved by a maintainer, and you must be assigned to that issue. PRs without prior approval will be closed.
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