feat(hint): H2 Phase C batch 4 — advanced-mode SQL tier-3 hints (ADR-0053)

Distinct SQL-syntax hints for the 11 advanced-mode forms: sql create
table / alter table / create index / drop index / drop table / insert /
update / delete, select, with, explain. hint_ids wired on all 11 nodes.

Hardened hint_key_for_input_in_mode for shared entry words: a bare
multi-form entry word defers to tier-2; when the second token isn't a
form word (insert into / update … set), it falls back to the
mode-primary key — so advanced mode resolves to the SQL form and simple
mode to the DSL form. catalogue + keys.rs registered. +2 spot tests +
grammar mode-disambiguation asserts; 2495 pass / 1 ignored, clippy clean.

src/app.rs

@@ -5901,6 +5901,27 @@ mod tests {
         assert!(!output_contains(&app, "rows stored in a table"));
     }
 
+    // ── Phase C batch 4: advanced-SQL hints (mode-aware) ────────
+
+    #[test]
+    fn f1_in_advanced_mode_renders_the_sql_insert_hint() {
+        let mut app = App::new();
+        app.mode = Mode::Advanced;
+        type_str(&mut app, "insert into Customers (name) values ('x')");
+        f1(&mut app);
+        assert!(output_contains(&app, "Insert rows with SQL"));
+        assert!(!output_contains(&app, "Add one or more rows"));
+    }
+
+    #[test]
+    fn f1_on_select_renders_the_select_hint() {
+        let mut app = App::new();
+        app.mode = Mode::Advanced;
+        type_str(&mut app, "select name from Customers");
+        f1(&mut app);
+        assert!(output_contains(&app, "heart of SQL"));
+    }
+
     #[test]
     fn messages_command_toggles_verbosity_and_reports() {
         let mut app = App::new();