feat(langchain_v1): add messages namespace

[eyurtsev]

PR is pending any potential changes in content blocks and v2 message format.

[vercel]

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1 Skipped Deployment

Name	Status	Preview	Comments	Updated (UTC)
langchain	⬜️ Ignored (Inspect)	Visit Preview		Jul 24, 2025 3:05pm

[codspeed-hq]

CodSpeed WallTime Performance Report

Merging #32229 will not alter performance

_{Comparing eugene/expose_messages (52daddf) with master (6f3169e)}

⚠️ Unknown Walltime execution environment detected

Using the Walltime instrument on standard Hosted Runners will lead to inconsistent data.

For the most accurate results, we recommend using CodSpeed Macro Runners: bare-metal machines fine-tuned for performance measurement consistency.

Summary

✅ 13 untouched benchmarks

[codspeed-hq]

CodSpeed Instrumentation Performance Report

Merging #32229 will not alter performance

_{Comparing eugene/expose_messages (52daddf) with master (0b34be4)¹}

Summary

✅ 14 untouched benchmarks

Footnotes

1. No successful run was found on master (6f3169e) during the generation of this report, so 0b34be4 was used instead as the comparison base. There might be some changes unrelated to this pull request in this report. ↩