feat: Consolidate on a single LangGraph orchestration #540
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This PR removes LangChain tools and Vertex AI Function Calling orchestration and consolidates on LangGraph.
It also flattens the directory structure and refactors to simplify some parts of code for easier understanding.
Note
The failure in the integration test is expected. This PR is part of a series of changes, and the corresponding fix for this test is in a subsequent PR.
Reasoning
We've intentionally split the work into smaller, focused PRs to make the review process more manageable and efficient.
Merge Plan
All related PRs will be merged into the
toolbox-mainbranch first. We will ensure all tests are passing ontoolbox-mainbefore merging the entire feature set intomain.