feat(smartfeed): Implement Smartfeed core: add feed validation, parsing, exporting and comprehensive tests

test/test.integration.node+bun+deno.ts

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+import { expect, tap } from '@git.zone/tstest/tapbundle';
+import * as smartfeed from '../ts/index.js';
+
+/**
+ * Integration test - Quick smoke test for the entire module
+ * For detailed tests, see:
+ * - test.creation.node+bun+deno.ts
+ * - test.validation.node+bun+deno.ts
+ * - test.export.node+bun+deno.ts
+ * - test.parsing.node+bun+deno.ts
+ */
+
+tap.test('integration: should create, populate, export, and parse a feed', async () => {
+  // Create instance
+  const smartfeedInstance = new smartfeed.Smartfeed();
+  expect(smartfeedInstance).toBeInstanceOf(smartfeed.Smartfeed);
+
+  // Create feed
+  const feed = smartfeedInstance.createFeed({
+    domain: 'example.com',
+    title: 'Integration Test Feed',
+    category: 'Technology',
+    company: 'Test Inc',
+    companyDomain: 'https://example.com',
+    companyEmail: 'test@example.com',
+    description: 'Full integration test',
+  });
+
+  expect(feed).toBeInstanceOf(smartfeed.Feed);
+
+  // Add items
+  feed.addItem({
+    title: 'Test Article 1',
+    authorName: 'Author',
+    imageUrl: 'https://example.com/image1.jpg',
+    timestamp: Date.now(),
+    url: 'https://example.com/article1',
+    content: 'Content 1',
+  });
+
+  feed.addItem({
+    title: 'Test Article 2',
+    authorName: 'Author',
+    imageUrl: 'https://example.com/image2.jpg',
+    timestamp: Date.now(),
+    url: 'https://example.com/article2',
+    content: 'Content 2',
+  });
+
+  expect(feed.items.length).toEqual(2);
+
+  // Export RSS
+  const rssString = feed.exportRssFeedString();
+  expect(rssString).toInclude('Integration Test Feed');
+  expect(rssString).toInclude('Test Article 1');
+  expect(rssString).toInclude('Test Article 2');
+
+  // Export Atom
+  const atomString = feed.exportAtomFeed();
+  expect(atomString).toInclude('Integration Test Feed');
+
+  // Export JSON
+  const jsonString = feed.exportJsonFeed();
+  const jsonFeed = JSON.parse(jsonString);
+  expect(jsonFeed.title).toEqual('Integration Test Feed');
+  expect(jsonFeed.items.length).toEqual(2);
+
+  // Parse back
+  const parsed = await smartfeedInstance.parseFeedFromString(rssString);
+  expect(parsed.title).toEqual('Integration Test Feed');
+  expect(parsed.items.length).toEqual(2);
+});
+
+export default tap.start();