refactor: nest Ruby LSP actions under core.lsp

src/ruby.rs

@@ -873,6 +873,19 @@ end
                 .unwrap_err()
                 .contains("must be a String")
         );
+        for target in [
+            "config.core.lsp_hover",
+            "config.core.lsp_definition",
+            "config.core.lsp_diagnostics",
+            "config.core.lsp.hvoer",
+            "config.core.lsp",
+        ] {
+            let invalid = fixture.file(
+                "invalid_action.rb",
+                &format!("Vamp.configure {{ |config| config.bind 'K', {target} }}"),
+            );
+            assert!(load_config(&invalid).is_err(), "{target}");
+        }
         let invalid = fixture.file("core.rb", "Vamp.plugin 'evil', core: true");
         assert!(RubyPlugin::start(&invalid, &serde_json::json!({})).is_err());
         let invalid = fixture.file("syntax.rb", "this is not valid ruby (");