style: rustfmt the blob-removal code (fix the CI fmt gate)

The blob-removal commit (6b4c4dc) failed CI's fmt gate — long assert! lines
and a doc comment that stock rustfmt wraps. No behaviour change; just
`cargo fmt`. Verified via `nix develop -c cargo fmt --check`.

src/persistence/migrations.rs

@@ -394,8 +394,7 @@ mod tests {
             "      - \"note <> 'type: blob'\"\n",
             "relationships: []\n",
         );
-        let outcome =
-            migrate_to_latest(body, &MigratorRegistry::production(), tmp.path()).unwrap();
+        let outcome = migrate_to_latest(body, &MigratorRegistry::production(), tmp.path()).unwrap();
         assert_eq!(outcome.migrated_from, Some(1));
         assert!(outcome.body.contains("version: 2"));
         // The blob column became text.

src/runtime.rs

@@ -180,9 +180,10 @@ pub async fn run(args: Args) -> Result<()> {
     // force a `.db` rebuild after the v1→v2 migration converts it to text
     // (the stale `.db` keeps a `STRICT … BLOB` engine column + `"blob"`
     // metadata that load otherwise uses as-is).
-    let had_blob_column = std::fs::read_to_string(project.path().join(crate::project::PROJECT_YAML))
-        .map(|b| crate::persistence::migrations::body_declares_blob_column(&b))
-        .unwrap_or(false);
+    let had_blob_column =
+        std::fs::read_to_string(project.path().join(crate::project::PROJECT_YAML))
+            .map(|b| crate::persistence::migrations::body_declares_blob_column(&b))
+            .unwrap_or(false);
     let migrate_registry = crate::persistence::migrations::MigratorRegistry::production();
     let migration_outcome = crate::persistence::migrations::ensure_project_yaml_migrated(
         project.path(),