style: format the whole tree with cargo fmt (stock defaults, #35)

One-time, mechanical reformat — no functional changes. The tree was not
rustfmt-clean (~1800 hunks across ~100 files); this brings it to stock
`cargo fmt` defaults so a `cargo fmt --check` CI gate can follow.
Behaviour-preserving: 2509 pass / 0 fail / 1 ignored (unchanged baseline),
clippy clean. A .git-blame-ignore-revs entry follows so `git blame`
skips this commit.

tests/it/case_insensitive_names.rs

@@ -24,8 +24,7 @@ fn rt() -> tokio::runtime::Runtime {
 
 fn open() -> (project::Project, Database, tempfile::TempDir) {
     let dir = tempfile::tempdir().expect("create tempdir");
-    let project =
-        project::open_or_create(None, Some(dir.path())).expect("open or create project");
+    let project = project::open_or_create(None, Some(dir.path())).expect("open or create project");
     let db = Database::open_with_persistence(
         project.db_path(),
         Persistence::new(project.path().to_path_buf()),
@@ -78,7 +77,10 @@ fn rename_column_with_case_variant_table_keeps_metadata_in_step() {
     let r = rt();
     r.block_on(db.create_table(
         "Items".to_string(),
-        vec![ColumnSpec::new("id", Type::Int), ColumnSpec::new("qty", Type::Int)],
+        vec![
+            ColumnSpec::new("id", Type::Int),
+            ColumnSpec::new("qty", Type::Int),
+        ],
         vec!["id".to_string()],
         Some("create".to_string()),
     ))
@@ -129,7 +131,11 @@ fn insert_with_case_variant_table_persists_and_survives_rebuild() {
         .block_on(db.query_data("Items".to_string(), None, None))
         .expect("query")
         .rows;
-    assert_eq!(rows.len(), 1, "the wrong-case insert survived the rebuild (no data loss)");
+    assert_eq!(
+        rows.len(),
+        1,
+        "the wrong-case insert survived the rebuild (no data loss)"
+    );
     assert_eq!(rows[0][1].as_deref(), Some("kept"));
 }
 
@@ -146,9 +152,19 @@ fn add_column_with_case_variant_table_survives_rebuild() {
     );
 
     let db = fresh_rebuild(db, &project, &r);
-    let desc = r.block_on(db.describe_table("Items".to_string())).expect("describe");
-    let qty = desc.columns.iter().find(|c| c.name == "qty").expect("qty added");
-    assert_eq!(qty.user_type, Some(Type::Int), "qty's user-type survived the rebuild");
+    let desc = r
+        .block_on(db.describe_table("Items".to_string()))
+        .expect("describe");
+    let qty = desc
+        .columns
+        .iter()
+        .find(|c| c.name == "qty")
+        .expect("qty added");
+    assert_eq!(
+        qty.user_type,
+        Some(Type::Int),
+        "qty's user-type survived the rebuild"
+    );
     // The CHECK is intact too (a negative qty is refused under the real table).
     assert!(
         r.block_on(db.insert(
@@ -175,9 +191,15 @@ fn drop_table_with_case_variant_name_clears_table_and_csv() {
          insert into Items (id, note) values (1, 'x')\n\
          drop table items\n",
     );
-    assert!(!tables(&db, &r).contains(&"Items".to_string()), "the table was dropped");
+    assert!(
+        !tables(&db, &r).contains(&"Items".to_string()),
+        "the table was dropped"
+    );
     let csv = project.path().join(project::DATA_DIR).join("Items.csv");
-    assert!(!csv.exists(), "the CSV was removed despite the case-variant drop");
+    assert!(
+        !csv.exists(),
+        "the CSV was removed despite the case-variant drop"
+    );
 
     // A fresh rebuild yields no Items (the metadata/yaml has no orphan).
     let db = fresh_rebuild(db, &project, &r);
@@ -224,12 +246,24 @@ fn add_relationship_with_case_variant_tables_survives_rebuild() {
          add 1:n relationship from parent.id to child.parent_id\n",
     );
     // The parent's inbound relationship is visible under the stored case.
-    let p = r.block_on(db.describe_table("Parent".to_string())).expect("describe Parent");
-    assert_eq!(p.inbound_relationships.len(), 1, "relationship recorded under the stored case");
+    let p = r
+        .block_on(db.describe_table("Parent".to_string()))
+        .expect("describe Parent");
+    assert_eq!(
+        p.inbound_relationships.len(),
+        1,
+        "relationship recorded under the stored case"
+    );
     assert_eq!(p.inbound_relationships[0].other_table, "Child");
 
     let db = fresh_rebuild(db, &project, &r);
-    let p = r.block_on(db.describe_table("Parent".to_string())).expect("describe Parent");
-    assert_eq!(p.inbound_relationships.len(), 1, "relationship survived the rebuild");
+    let p = r
+        .block_on(db.describe_table("Parent".to_string()))
+        .expect("describe Parent");
+    assert_eq!(
+        p.inbound_relationships.len(),
+        1,
+        "relationship survived the rebuild"
+    );
     assert_eq!(p.inbound_relationships[0].other_table, "Child");
 }