test(example): cut the visual regression PoC back to PoC scope

Three review rounds turned the reproduction script into a 1,200-line
runner and the evidence folder into 29,000 lines of accessibility-tree
dumps. Neither is what a proof of concept needs. This commit keeps:

- the results (README), the pinned environment, the four baselines and
  the two test ids;
- the diff JSON every table is computed from, the diff images, and the
  19 agent-device issues with their evidence;
- two small excerpts replacing the full accessibility-tree snapshots,
  each saying how to regenerate the full tree;
- hand-run CLI commands to reproduce, instead of a script.

Removed from this PR: run.mjs, run.test.mjs, evidence/summarize.mjs and
summary.md, evidence/runs, evidence/runner, the full evidence/a11y
trees, and the example/package.json test script. All of it is preserved
unchanged on branch poc/agent-device-visual-runner, and the README
lists what a real runner would have to handle, learned from it.

Author: JKobrynski

example/package.json

@@ -8,8 +8,7 @@
     "eas-build-pre-install": "cd .. && yarn",
     "start": "EXPO_NO_TYPESCRIPT_SETUP=1 expo start --dev-client",
     "android": "EXPO_NO_TYPESCRIPT_SETUP=1 expo run:android",
-    "ios": "EXPO_NO_TYPESCRIPT_SETUP=1 expo run:ios",
-    "test:visual": "node --test visual/run.test.mjs"
+    "ios": "EXPO_NO_TYPESCRIPT_SETUP=1 expo run:ios"
   },
   "dependencies": {
     "@expo/metro-config": "~56.0.0",

example/visual/README.md

@@ -0,0 +1,74 @@
+{
+  "about": "Excerpts from the XCUITest / UiAutomator trees captured 2026-09-10 with `npx agent-device@0.21.0 snapshot --raw --force-full --json`. The full trees (13,500 lines) are on branch poc/agent-device-visual-runner under example/visual/evidence/a11y/. Test id at the time: surface-elevated (renamed surface-example-elevated later; the rename changes no pixel).",
+  "ios": {
+    "with_accessible": {
+      "total_nodes": 115,
+      "elevation_labelled_nodes": 2,
+      "surface_section_node": [
+        {
+          "type": "Other",
+          "role": "RCTViewComponentView",
+          "identifier": "surface-elevated",
+          "label": "Elevated surface, Elevation 0, Elevation 1, Elevation 2, Elevation 3, Elevation 4, Elevation 5, Vertical scroll bar, 3 pages",
+          "rect": {
+            "x": 0,
+            "y": 134,
+            "width": 402,
+            "height": 214
+          }
+        }
+      ]
+    },
+    "testID_only": {
+      "total_nodes": 177,
+      "elevation_labelled_nodes": 26,
+      "surface_section_node": [
+        {
+          "type": "Other",
+          "role": "RCTViewComponentView",
+          "identifier": "surface-elevated",
+          "rect": {
+            "x": 0,
+            "y": 134,
+            "width": 402,
+            "height": 214
+          }
+        }
+      ]
+    }
+  },
+  "android": {
+    "with_accessible": {
+      "total_nodes": 217,
+      "elevation_labelled_nodes": 13,
+      "surface_section_node": [
+        {
+          "type": "android.view.ViewGroup",
+          "identifier": "surface-elevated",
+          "rect": {
+            "x": 0,
+            "y": 372,
+            "width": 1280,
+            "height": 642
+          }
+        }
+      ]
+    },
+    "testID_only": {
+      "total_nodes": 217,
+      "elevation_labelled_nodes": 13,
+      "surface_section_node": [
+        {
+          "type": "android.view.ViewGroup",
+          "identifier": "surface-elevated",
+          "rect": {
+            "x": 0,
+            "y": 372,
+            "width": 1280,
+            "height": 642
+          }
+        }
+      ]
+    }
+  }
+}