Fix/edit tool calls

[i1bro]

Summary

• capture file-change context from app-server events for later approval and tool-call updates
• use edited file paths as edit tool-call titles instead of the generic "Editing files"
• attach file locations and diff data to edit tool calls, with a turn-diff fallback when needed
• serialize session updates so the initial tool call is emitted before its completion update

Why

This makes edit tool calls understandable in the UI and avoids races where a completion update can arrive before the corresponding tool call exists.

Testing

• npm test

[AlexandrSuhinin]

I'm not sure why do we need a queue and then why we need to flush it instead of handling events?

[i1bro]

Because sendPrompt() must not return until all earlier events have been handled.

[AlexandrSuhinin]

Can you clarify why do we need state management to handle notifications instead of calling "handler" when event arrives?

[i1bro]

We need the per-session pending promise because notification handling is async: handleNotification() awaits createUpdateEvent() and session.update(), and file-change events may read files to reconstruct ACP diffs. The stored promise chain preserves event order and lets awaitSessionIdle() wait for all pending ACP updates before prompt completion.

[AlexandrSuhinin]

Why we manually create patch lines? Don't we have it already in change?

[i1bro]

To convert the diff to ACP format and return as ACP "diff" content block. It needs oldText/newText