False positive: In "built in debug mode", "built in" is wrongly flagged to change to hyphenated "built-in"

**What got flagged?**

> This `raddbg.exe` will have been built in **debug mode**, which is not built

**Why is this incorrect?**

This sentence does not talk about a kind of debug mode which is "built in". It talks about which mode the exe was built in. Thus the `in` associates with `mode` and not with `built'.

Reproduce the report using the sentence containing “built in debug mode” and inspect Harper’s grammar-checking rules and tests for hyphenation. The fix is done when this usage is not flagged, while genuine adjectival uses of “built-in” remain covered by tests.

Written by the indexing model from the issue text.