style(engine): rustfmt verify.rs

Removes one blank line that cargo fmt --all --check flagged; the hosted Lint job would fail on it. Verified: cargo fmt --all -- --check clean.

Co-Authored-By: Claude Sonnet 5.5 <[email protected]>

crates/engine/src/tools/verify.rs

@@ -432,7 +432,6 @@ self-check of whether what you just did is actually correct and complete."
             ));
         };
 
-
         // --- Deterministic evidence gathering ---
         let mut evidence: Vec<EvidenceBlock> = Vec::new();
         if gather_diff_scope {