feat(amazon-shopping): parse filters and extract search candidates

skills/amazon-shopping/tests/query-parser.test.ts

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+import assert from "node:assert/strict";
+import { describe, it } from "node:test";
+
+import { parseNaturalLanguageRequest } from "../src/query-parser.js";
+
+describe("parseNaturalLanguageRequest", () => {
+  it("extracts the target LED bulb filters from natural language", () => {
+    const parsed = parseNaturalLanguageRequest(
+      "100w led bulbs that cost less than $4 each and have over 200 reviews with a review score of more than 4.5 stars"
+    );
+
+    assert.equal(parsed.query, "100w led bulbs");
+    assert.equal(parsed.filters.maxUnitPrice, 4);
+    assert.equal(parsed.filters.minReviews, 200);
+    assert.equal(parsed.filters.reviewCountComparison, "gt");
+    assert.equal(parsed.filters.minRating, 4.5);
+    assert.equal(parsed.filters.ratingComparison, "gt");
+  });
+
+  it("distinguishes inclusive review and rating phrasing", () => {
+    const parsed = parseNaturalLanguageRequest("usb c charger at least 500 reviews and 4.3 stars or better");
+
+    assert.equal(parsed.query, "usb c charger");
+    assert.equal(parsed.filters.minReviews, 500);
+    assert.equal(parsed.filters.reviewCountComparison, "gte");
+    assert.equal(parsed.filters.minRating, 4.3);
+    assert.equal(parsed.filters.ratingComparison, "gte");
+  });
+
+  it("extracts limit and max product price phrases", () => {
+    const parsed = parseNaturalLanguageRequest("return 5 wireless mouse under $30");
+
+    assert.equal(parsed.query, "wireless mouse");
+    assert.equal(parsed.limit, 5);
+    assert.equal(parsed.filters.maxPrice, 30);
+  });
+});