codeSplitters dependency doctor: an agent fixes the update that broke the tests #196

Follow-up to #194. The doctor leaves out an update that breaks the tests and shows the test output. Next, hand that update to a coding agent: give it the failing output, the changelog and the repo's line history for the affected API, and let it patch the call sites on the same deps-<date> branch until the tests pass, or give up after N tries.

This needs agent runs that span several files; runAgent edits one file today.

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