[Snyk] Security upgrade langchain from 0.0.163 to 0.1.29

[gmickel]

Snyk has created this PR to fix 1 vulnerabilities in the npm dependencies of this project.

Snyk changed the following file(s):

• package.json

Vulnerabilities that will be fixed with an upgrade:

	Issue	Score
	Prototype Pollution SNYK-JS-EXPREVAL-13833679	751

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🦉 Prototype Pollution

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[chatgpt-codex-connector]

Migrate code to new langchain packages before upgrading

Bumping langchain straight to ^0.1.29 is a breaking change because 0.1.x split most exports into the new @langchain/* and langchain-community packages. The codebase still imports symbols from paths like langchain/llms/openai and langchain/vectorstores/hnswlib in src/index.ts, src/lib/contextManager.ts, and others, which no longer exist in 0.1.x. Attempting to build or run after this upgrade will fail with module-resolution errors unless the imports (and additional dependencies) are migrated. The dependency update should be paired with the required code changes or postponed.

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