Urgent control requests can now jump the upload queue

What

Claude Code's remote-tools upload pipeline can now let certain requests jump ahead of the normal batch queue:

• A session/worker class gained two new fields, servedCallRequestsJumpQueue and urgentRequestIds (a Set), alongside its existing heartbeat/upload-trim state.
• Whether jump-queue behavior is active is decided by a helper that checks the CLAUDE_CODE_REMOTE_TOOLS_JUMP_QUEUE environment variable, falling back to the feature gate tengu_valiant_rain (off by default).
• In the client's event-writing pipeline, control_request/control_cancel_request events are now routed into a separate 'urgent' queue and sent immediately ahead of the normal batch when servedCallRequestsJumpQueue() is true, with urgent request IDs tracked in a bounded set.

Why

This lets time-sensitive control requests, like cancellations, get delivered promptly instead of waiting behind a backlog of normal batched uploads.