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/typing_surface/delete_with_where.rs

@@ -42,13 +42,8 @@ fn after_where_offers_active_table_columns_no_leakage() {
 #[test]
 fn after_where_column_equals_offers_typed_prose() {
     let schema = schema_serial_pk();
-    let a = assess_at_end(
-        "delete from Customers where Email=",
-        &schema,
-    );
-    let prose = hint_prose(&a).unwrap_or_else(|| {
-        panic!("expected Prose, got {:?}", a.hint)
-    });
+    let a = assess_at_end("delete from Customers where Email=", &schema);
+    let prose = hint_prose(&a).unwrap_or_else(|| panic!("expected Prose, got {:?}", a.hint));
     assert!(
         prose.contains("Email"),
         "should name `Email`, got prose: {prose:?}",
@@ -63,10 +58,7 @@ fn after_where_column_equals_offers_typed_prose() {
 #[test]
 fn complete_delete_with_where_parses() {
     let schema = schema_serial_pk();
-    let a = assess_at_end(
-        "delete from Customers where id=1",
-        &schema,
-    );
+    let a = assess_at_end("delete from Customers where id=1", &schema);
     assert!(matches!(a.state, InputState::Valid));
     assert_eq!(a.parse_result.as_deref(), Ok("Delete"));
     crate::snap!("complete_delete", a);
@@ -76,9 +68,7 @@ fn complete_delete_with_where_parses() {
 fn delete_with_datetime_column_says_yyyy_mm_dd_t() {
     let schema = schema_every_type();
     let a = assess_at_end("delete from Things where ts=", &schema);
-    let prose = hint_prose(&a).unwrap_or_else(|| {
-        panic!("expected Prose, got {:?}", a.hint)
-    });
+    let prose = hint_prose(&a).unwrap_or_else(|| panic!("expected Prose, got {:?}", a.hint));
     assert!(
         prose.contains("ts"),
         "should name `ts`, got prose: {prose:?}",