feat(langchain): v1 WIP

[eyurtsev]

This PR adds scaffolding for langchain 1.0 entry package.

Most contents have been removed.

Currently remaining entrypoints for:

• chat models
• embedding models
• memory -> trimming messages, filtering messages and counting tokens [we may remove this]
• prompts -> we may remove some prompts
• storage: primarily to support cache backed embeddings, may remove the kv store
• tools -> report tool primitives

Things to be added:

• Selected agent implementations
• Selected workflows
• Common primitives: messages, Document
• Primitives for type hinting: BaseChatModel, BaseEmbeddings
• Selected retrievers
• Selected text splitters

Things to be removed:

• Globals needs to be removed (needs an update in langchain core)

Todos:

• TBD indexing api (requires sqlalchemy which we don't want as a dependency)
• Be explicit about public/private interfaces (e.g., likely rename chat_models.base.py to something more internal)
• Remove dockerfiles
• Update module doc-strings and README.md

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1 Skipped Deployment

Name	Status	Preview	Comments	Updated (UTC)
langchain	⬜️ Ignored (Inspect)	Visit Preview		Jul 23, 2025 7:47pm

[codspeed-hq]

CodSpeed WallTime Performance Report

Merging #32166 will not alter performance

_{Comparing v1_release/lc (cae7ea9) with master (a7d0e42)}

⚠️ 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 #32166 will not alter performance

_{Comparing v1_release/lc (cae7ea9) with master (a7d0e42)}

Summary

✅ 14 untouched benchmarks

[mdrxy]

Is this meant for the dev container?

[eyurtsev]

No idea why it's there I'll remove do a quick follow up to clean up everything we don't need