Add Echo Pad listing

f22ed9-echo-pad/EchoPad/arithmetic-check.json

@@ -0,0 +1,64 @@
+{
+  "data": {
+    "type": "card",
+    "attributes": {
+      "boardName": "Arithmetic check",
+      "inkJson": 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+      "viewportJson": "{\"x\":168,\"y\":9,\"zoom\":0.61}",
+      "echoes": [
+        {
+          "label": "Echo № 1",
+          "mode": "auto",
+          "content": "12 + 7 = 19, not 21 ✗ → 19",
+          "x": 1366,
+          "y": 147,
+          "width": 340,
+          "acceptedAt": "2026-07-29T14:51:24.956Z",
+          "sketchJson": null,
+          "sceneJson": null
+        },
+        {
+          "label": "Echo № 2",
+          "mode": "auto",
+          "content": "5 × 3 = 15",
+          "x": 1207,
+          "y": 436,
+          "width": 340,
+          "acceptedAt": "2026-07-29T14:51:52.151Z",
+          "sketchJson": "{\"polylines\":[],\"labels\":[{\"text\":\"15\",\"x\":1081.986689539992,\"y\":454.1526972433873,\"size\":44.954856762614234}]}",
+          "sceneJson": null
+        },
+        {
+          "label": "Echo № 3",
+          "mode": "auto",
+          "content": "x² = 16 → x = ±√16 = ±4\n(don't forget the negative root!)",
+          "x": 1093,
+          "y": 689,
+          "width": 340,
+          "acceptedAt": "2026-07-29T14:52:54.518Z",
+          "sketchJson": null,
+          "sceneJson": null
+        }
+      ],
+      "cardInfo": {
+        "name": "Arithmetic check",
+        "summary": "Handwritten sum with a wrong answer — the marker checks it",
+        "notes": null,
+        "cardThumbnailURL": null
+      }
+    },
+    "relationships": {
+      "cardInfo.theme": {
+        "links": {
+          "self": null
+        }
+      }
+    },
+    "meta": {
+      "adoptsFrom": {
+        "module": "../echo-pad/echo-pad",
+        "name": "EchoPad"
+      }
+    }
+  }
+}

f22ed9-echo-pad/EchoPad/diagram-complete.json

@@ -0,0 +1,42 @@
+{
+  "data": {
+    "type": "card",
+    "attributes": {
+      "boardName": "Diagram complete",
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+      "echoes": [
+        {
+          "label": "Echo № 1",
+          "mode": "auto",
+          "content": "This is a house outline missing its roof — rectangle walls + a door, but no triangle on top.\nCompleting it: add a peaked roof connecting the top corners.",
+          "x": 751,
+          "y": 63,
+          "width": 340,
+          "acceptedAt": "2026-08-05T10:12:22.738Z",
+          "sketchJson": "{\"polylines\":[[457.1309719411182,224.1715257593184,587.100538595693,165.16297413048423,718.0698711476108,224.1715257593184]],\"labels\":[{\"text\":\"roof\",\"x\":572.1040501355499,\"y\":185.16587298771617,\"size\":12.001739314339153}]}",
+          "sceneJson": null
+        }
+      ],
+      "cardInfo": {
+        "name": "Diagram complete",
+        "summary": "An unfinished figure the marker completes in red ink",
+        "notes": null,
+        "cardThumbnailURL": null
+      }
+    },
+    "relationships": {
+      "cardInfo.theme": {
+        "links": {
+          "self": null
+        }
+      }
+    },
+    "meta": {
+      "adoptsFrom": {
+        "module": "../echo-pad/echo-pad",
+        "name": "EchoPad"
+      }
+    }
+  }
+}