chore(v1): bump langgraph pin to combo branch
Companion CI pin moved from sr/tool-call-no-state-inline to
sr/deepagents-perf-combo so CI exercises the full delta + hydrate +
add_messages perf stack together (same branch deepagents is tracking).
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
