Improve tracing for nested tool calls and exec processes - #41950
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## Why Code-mode callbacks can outlive their initial request and run in separate tasks, so their trace context must be preserved explicitly. ## What changed - Preserve the execution context for code-mode callbacks and add spans for nested tool invocations in the runtime and dispatch broker. - Propagate each tool invocation span as the parent of its streamed gRPC callback, falling back to the outer execution context when needed. - Add a `codex.exec_server.process` span for each process lifetime, including its process ID and completion result, without retaining the request span. GitOrigin-RevId: a6059e34d895416f5517e51dad6ca0078355adca
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Improve tracing for nested tool calls and exec processes
Why
Code-mode callbacks can outlive their initial request and run in separate tasks,
so their trace context must be preserved explicitly.
What changed
nested tool invocations in the runtime and dispatch broker.
callback, falling back to the outer execution context when needed.
codex.exec_server.processspan for each process lifetime, includingits process ID and completion result, without retaining the request span.