Step 164: add update checker and installer manifests

editor/tests/step164_test.cpp

@@ -0,0 +1,39 @@
+// Step 164 TDD Test: Update checker (file manifest)
+#include "UpdateChecker.h"
+#include <iostream>
+#include <filesystem>
+#include <fstream>
+
+static void expect(bool cond, const std::string& name, int& passed, int& failed) {
+    if (cond) {
+        std::cout << "Test " << (passed + failed + 1) << " PASS: " << name << "\n";
+        ++passed;
+    } else {
+        std::cout << "Test " << (passed + failed + 1) << " FAIL: " << name << "\n";
+        ++failed;
+    }
+}
+
+int main() {
+    int passed = 0;
+    int failed = 0;
+
+    namespace fs = std::filesystem;
+    fs::path root = fs::temp_directory_path() / "whetstone_update_test";
+    fs::create_directories(root);
+    fs::path manifest = root / "manifest.json";
+
+    std::ofstream out(manifest.string());
+    out << "{ \"version\": \"1.2.3\", \"url\": \"https://example.com\", \"notes\": \"test\" }";
+    out.close();
+
+    UpdateChecker checker;
+    UpdateInfo info = checker.check(std::string("file://") + manifest.string());
+    expect(info.available, "update available", passed, failed);
+    expect(info.version == "1.2.3", "version parsed", passed, failed);
+    expect(info.url == "https://example.com", "url parsed", passed, failed);
+
+    std::cout << "\n=== Step 164 Results: " << passed << " passed, "
+              << failed << " failed ===\n";
+    return failed == 0 ? 0 : 1;
+}