[codex] Add LangGraph history loading and branch tree

[blove]

Summary

• Load LangGraph thread history via threads.getHistory() on thread selection and after completed runs.
• Add an Angular-owned experimentalBranchTree() signal derived from checkpoint parent links.
• Update LangGraph docs/API output to remove the obsolete branch-tree limitation and clarify neutral vs raw history.

Test Plan

• npx vitest run --config vite.config.mts libs/langgraph/src/lib/transport/fetch-stream.transport.spec.ts libs/langgraph/src/lib/internals/stream-manager.bridge.spec.ts libs/langgraph/src/lib/internals/branch-tree.spec.ts --reporter=verbose
• npx nx test langgraph
• npx nx lint langgraph
• npx nx build langgraph
• npm run generate-api-docs
• npx nx lint website
• npx nx build website
• git diff --check

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Project	Deployment	Actions	Updated (UTC)
cacheplane	Ready	Preview, Comment	May 2, 2026 4:32am