code-mode: introduce durable session interface#24180
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Summary
Introduce a
CodeModeSessioninterface for executing and managing code-mode cells.This moves cell lifecycle, callback delegation, termination, and shutdown behind a session abstraction, while continuing to use the existing in-process implementation, and the ability to implement an external process one behind this interface.
A Codex session owns one
CodeModeSession, which in turn owns its running cells and stored code-mode state. Each cell is represented to the caller as aStartedCell, exposing its cell ID and initial response.It also introduces a
CodeModeSessionDelegatecallback interface. A session uses the delegate to invoke nested host tools and emit notifications while a cell is running, allowing the runtime to communicate with its owning Codex session without depending directly on core turn handling.