rhan-oai 2dbe6bfa44
Cancel MCP tool requests when response futures are dropped ( #56132 ) ...
## Why
Dropping a local tool-call future did not notify the MCP server that the request was cancelled, leaving remote work running.
## What changed
- Send a cancellation notification for the request when its response future is dropped, covering both ordinary tool calls and tool-input rounds.
- Preserve write order for stdio and in-process transports so cancellation cannot arrive before its tool request, without waiting for tool responses.
## Testing
Add regression tests for cancellation on drop, request-before-cancellation ordering under reversed send polling and exhausted task budgets, and continued use of the shared connection after cancellation.
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rhan-oai
2dbe6bfa44