feat(core): add HoverController

.ai/rules/stories-format.md

@@ -257,6 +257,23 @@ export const StaticColors: Story = {
 
 The decorator displays two background zones—dark gradient for `static-color="white"` content, light gradient for `static-color="black"` content.
 
+## Story naming
+
+When the camelCase export name does not produce a readable display name — for example, `TextWrapping` for a story that should appear as "Text wrapping" — set the display name via `storyName` assigned after the export:
+
+```typescript
+/**
+ * When the pointer moves from the trigger into the popover bubble, the popover stays
+ * open...
+ */
+export const TextWrapping: Story = {
+  tags: ['behaviors'],
+};
+TextWrapping.storyName = 'Text wrapping';
+```
+
+Do **not** use a `### Heading` at the top of a JSDoc comment as a proxy for the story's display name. JSDoc H3 headings are only appropriate for sub-sections within the documentation body (for example, `### Features` and `### Best practices` inside an Accessibility story).
+
 ## Story ordering
 
 Control display order within sections using `section-order`. Stories sort by lowest value first, then alphabetically for ties or missing values.

2nd-gen/packages/core/controllers/hover-controller/index.ts

@@ -0,0 +1,17 @@
+/**
+ * Copyright 2026 Adobe. All rights reserved.
+ * This file is licensed to you under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License. You may obtain a copy
+ * of the License at http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software distributed under
+ * the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR REPRESENTATIONS
+ * OF ANY KIND, either express or implied. See the License for the specific language
+ * governing permissions and limitations under the License.
+ */
+
+export {
+  HoverController,
+  type HoverControllerHost,
+  type HoverControllerOptions,
+} from './src/hover-controller.js';