chore: cargo fmt

Single-line collapse in DocsServiceImpl::delete's $in match arm
flagged by `cargo fmt --check` post-review. The v1 HANDBACK §8
claimed `cargo fmt --check` was green; that claim was false against
HEAD at audit time. This fixes the diff so all three gates exit 0
on a fresh checkout. The follow-up HANDBACK update replaces §8's
false attestation with a post-fix one.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

crates/manager-core/src/docs_service.rs

@@ -453,8 +453,7 @@ mod tests {
                 let Some(arr) = cond.value.as_array() else {
                     return false;
                 };
-                arr.iter()
-                    .any(|v| actual == json_text(v).as_deref())
+                arr.iter().any(|v| actual == json_text(v).as_deref())
             }
         }
     }