feat(extension): add bsk hover and adjust vom to support

crates/bsk-protocol/schema/tool_hover_params.json

@@ -0,0 +1,72 @@
+{
+  "$schema": "http://json-schema.org/draft-07/schema#",
+  "title": "HoverParams",
+  "type": "object",
+  "required": [
+    "session_id"
+  ],
+  "properties": {
+    "modifiers": {
+      "type": [
+        "array",
+        "null"
+      ],
+      "items": {
+        "$ref": "#/definitions/KeyModifier"
+      }
+    },
+    "ref": {
+      "description": "Optional `@e<N>` ref allocated by the last observation. Mutually exclusive with `selector`.",
+      "type": [
+        "string",
+        "null"
+      ]
+    },
+    "selector": {
+      "type": [
+        "string",
+        "null"
+      ]
+    },
+    "session_id": {
+      "type": "string"
+    },
+    "settle_ms": {
+      "description": "Wait after the mouse move so hover-triggered UI can settle.",
+      "type": [
+        "integer",
+        "null"
+      ],
+      "format": "uint32",
+      "minimum": 0.0
+    },
+    "tab_id": {
+      "description": "Target tab. Defaults to the Agent Window's active tab.",
+      "type": [
+        "integer",
+        "null"
+      ],
+      "format": "int64"
+    },
+    "timeout_ms": {
+      "type": [
+        "integer",
+        "null"
+      ],
+      "format": "uint32",
+      "minimum": 1.0
+    }
+  },
+  "definitions": {
+    "KeyModifier": {
+      "description": "Keyboard modifier flags. Multiple flags may be combined; the extension folds them into CDP's bitfield (`alt=1, ctrl=2, meta=4, shift=8`).",
+      "type": "string",
+      "enum": [
+        "alt",
+        "ctrl",
+        "meta",
+        "shift"
+      ]
+    }
+  }
+}