fix(amazon-shopping): verify prime and delivery filters

skills/amazon-shopping/tests/product-metrics.test.ts

@@ -0,0 +1,56 @@
+import assert from "node:assert/strict";
+import { describe, it } from "node:test";
+
+import { extractWidthInches, formatWidthInches } from "../src/product-metrics.js";
+import type { ProductSearchResult } from "../src/types.js";
+
+function product(overrides: Partial<ProductSearchResult>): ProductSearchResult {
+  return {
+    asin: "B0WIDTH001",
+    title: "Base Product",
+    url: "https://www.amazon.com/dp/B0WIDTH001",
+    specs: [],
+    bullets: [],
+    matchedFilters: [],
+    missingFields: [],
+    extractionNotes: [],
+    ...overrides
+  };
+}
+
+describe("product metrics", () => {
+  it("extracts explicit W dimensions from overall product specs", () => {
+    const width = extractWidthInches(product({
+      specs: [{ name: "Product Dimensions", value: "35\"D x 83.4\"W x 31\"H" }]
+    }));
+
+    assert.equal(width, 83.4);
+  });
+
+  it("uses dimension order labels when W is not repeated in the value", () => {
+    const width = extractWidthInches(product({
+      specs: [{ name: "Item Dimensions D x W x H", value: "35 x 108 x 31 inches" }]
+    }));
+
+    assert.equal(width, 108);
+  });
+
+  it("ignores non-overall width specs before falling back to title width", () => {
+    const width = extractWidthInches(product({
+      title: "83 Inch Sofa Bed",
+      specs: [
+        { name: "Seat Interior Width", value: "65 Inches" },
+        { name: "Arm Width", value: "5 Inches" },
+        { name: "Minimum Required Door Width", value: "72 Inches" }
+      ]
+    }));
+
+    assert.equal(width, 83);
+  });
+
+  it("formats unknown and decimal widths", () => {
+    assert.equal(formatWidthInches(undefined), "unknown");
+    assert.equal(formatWidthInches(83.4), "83.4\"");
+    assert.equal(formatWidthInches(108), "108\"");
+  });
+});