Improved search/replace logic, to protect against llm errors

[OAGr]

We were getting errors with REPLACE blocks failing, and then that not being detected - this seeks to help a bit.

[changeset-bot]

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[OAGr]

Going to merge, to get working with the other PR and future changes. Feel free to comment later if you want!

It is pretty small, and I imagine we'll iterate a lot around here.