chore: update langchain dependencies and refactor SimilarityModel

[GordonSmith]

No description provided.

[Copilot]

Pull request overview

This PR upgrades the LangChain dependency stack to the v1.x packages and adjusts the extension’s SimilarityModel implementation to the new vector store import path, alongside adding a unit test intended to validate SimilarityModel behavior under the updated dependencies.

Changes:

• Bump LangChain-related packages (@langchain/*, langchain) to v1.x.
• Refactor src/ecl/docs/SimilarityModel.ts to import MemoryVectorStore from @langchain/classic.
• Add a SimilarityModel test and update Vitest configuration to run it.

Reviewed changes

Copilot reviewed 4 out of 5 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
vitest.config.ts	Updates Vitest test allow-list to include the new SimilarityModel test.
test/SimilarityModel.test.ts	Adds test coverage around SimilarityModel/store loading behavior (and/or dependency compatibility).
src/ecl/docs/SimilarityModel.ts	Switches MemoryVectorStore import to @langchain/classic for LangChain v1 compatibility.
package.json	Upgrades LangChain packages to v1.x.
package-lock.json	Lockfile refresh for the dependency upgrades.

[jeclrsg]

@GordonSmith does that current SimilarityModel test file contain any useful tests?

[jeclrsg]

Shouldn't this be testing LlamaEmbeddings from SimilarityModel? It seems like it's currently just testing if the langchain does what it's supposed to.

[github-actions]

🎉 This change has been included in ecl-v2.37.0 🎉

The release is available on:

• GitHub releases: ecl: v2.37.0

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