test(dojo): re-record langgraph-python agenticChatPage event traces

The goldens were recorded against a CopilotKit runtime that injected an
'App Context' message carrying copilotkit_forwarded_headers as the thread's
first message; the runtime the dojo now pins (react-core 1.69.3 via
CopilotKit#6756, released @Ag-ui 0.0.59) no longer injects it, so every
journey ran one STATE_SNAPSHOT short of its golden. This failure predates the
subagent work on this branch — it appears on every commit since the preview
pin flip — and is drift in the recorded environment, not a regression here:
the TypeScript lane re-recorded with no semantic changes, and its goldens
never contained the injected message.

Re-recorded via 'pnpm event-trace:update --spec agenticChatPage' against live
langgraph-cli backends; both lanes' specs pass in normal mode afterwards.

Author: mme