fix: detect verse in competitor comparisons

[hydraxman]

Note

This pull request was created with the assistance of an LLM.

Summary

• detect verse used as a comparison marker before a proper competitor name
• preserve the existing verse verb-form corrections and avoid broad single-word replacement

Problem

VerseAsVerb only recognized fixed phrases such as verse against and missed the reported comparison: Civic verse twin turbo Lamborghini. This leaves users without the intended versus correction.

The added path requires a capitalized competitor before verse and a proper noun at the end of the opposing phrase, limiting false positives for ordinary noun uses of verse.

Testing

• cargo test -p harper-core --lib — 6,092 passed, 290 ignored
• cargo clippy -p harper-core --lib -- -D warnings — passed
• cargo fmt --check — passed
• git diff --check — passed

Fixes #3966