fix(mcp): cancel bundled requests when agent runs stop (#124425)

fix(mcp): cancel bundled requests when agent runs stop (#124425)

* fix(mcp): cancel materialized requests

* fix(mcp): keep request cancellation internal

* fix(mcp): type internal request options

* fix(mcp): separate internal request signatures

* fix(mcp): keep runtime factory surface stable

* fix(mcp): preserve optional request methods

* fix(mcp): preserve public runtime contract

* chore(mcp): preserve contributor credit

Co-authored-by: chengzhichao-xydt 

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Co-authored-by: chengzhichao-xydt