[codex] Add LangGraph subagent lookup helpers

[blove]

Summary

Adds the remaining subagent lookup helper parity methods to the Angular LangGraph surface:

• getSubagent(toolCallId) for direct tool-call lookup
• getSubagentsByType(type) for subagent type/name filtering
• getSubagentsByMessage(message) for resolving all subagents spawned by an AI message's tool calls

The implementation reuses the existing subagents() state and does not import the SDK UI runtime. Mock agent helpers and docs/API docs are updated, and the old limitation entry is removed.

Validation

• npx vitest run --config vite.config.mts src/lib/agent.fn.spec.ts -t "helper methods" --reporter=verbose (RED before implementation, green after)
• 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
• git diff --check

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Project	Deployment	Actions	Updated (UTC)
cacheplane	Ready	Preview, Comment	May 2, 2026 3:26am