[codex] Track LangGraph subagent streams

[blove]

Summary

• Enable LangGraph subgraph streaming and preserve namespaced stream events.
• Track delegated subagent work through a narrow Angular-side tracker so subagents() and activeSubagents() update without pulling the full SDK UI runtime barrel into app bundles.
• Update agent docs/API docs to describe supported subagent tracking and the remaining helper-method limitation.

Validation

• npx vitest run --config vite.config.mts src/lib/transport/fetch-stream.transport.spec.ts --reporter=verbose
• npx vitest run --config vite.config.mts src/lib/internals/stream-manager.bridge.spec.ts src/lib/agent.fn.spec.ts --reporter=verbose
• npx nx test langgraph
• npx nx lint langgraph (passes with existing warnings)
• npx nx build langgraph
• npm run generate-api-docs
• npx nx lint website
• npx nx build website
• npx nx build cockpit-chat-subagents-angular --configuration=production --skip-nx-cache
• npx nx run-many -t build --projects='cockpit-*-angular' --skip-nx-cache
• git diff --check

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Project	Deployment	Actions	Updated (UTC)
cacheplane	Ready	Preview, Comment	May 2, 2026 1:29am