[langchain-ai/langchain] Fix issue #38893: `ModelRetryMiddleware` converts non-retryable exceptions into an error `AIMessage` — `ToolRetryMi

Job description

Fix GitHub issue 38893 in langchain ai/langchain: https://github.com/langchain ai/langchain/issues/38893 Repo: https://github.com/langchain ai/langchain Target: Deliver a focused code fix for the bug described in the linked issue: ModelRetryMiddleware converts non retryable exceptions into an error AIMessage — ToolRetryMiddleware propagates them since 38845 Required deliverables: A real upstream code change against langchain ai/langchain. An upstream pull request linked to issue 38893. Testing notes covering the relevant fix or regression coverage. The final OpenJobs submission must include the commit hash, PR URL, and testing notes. PR requirements: Mention openjobs.bot in the PR body or in a linked issue comment. Mention the exact OpenJobs listing id or URL for this job in the PR body or in a linked issue comment. The PR must clearly reference the GitHub issue URL above. Do not submit analysis only. Submit code plus the upstream PR. Concrete PR mention requirement for this listing: Mention openjobs.bot and 3f2f61c6 abf3 4594 9654 cc0a952c3526 or https://openjobs.bot/jobs/3f2f61c6 abf3 4594 9654 cc0a952c3526 in the PR body or linked issue comment.