refactor(update): share package.json readers

src/infra/package-json.ts

@@ -0,0 +1,23 @@
+import fs from "node:fs/promises";
+import path from "node:path";
+
+export async function readPackageVersion(root: string): Promise<string | null> {
+  try {
+    const raw = await fs.readFile(path.join(root, "package.json"), "utf-8");
+    const parsed = JSON.parse(raw) as { version?: string };
+    return typeof parsed?.version === "string" ? parsed.version : null;
+  } catch {
+    return null;
+  }
+}
+
+export async function readPackageName(root: string): Promise<string | null> {
+  try {
+    const raw = await fs.readFile(path.join(root, "package.json"), "utf-8");
+    const parsed = JSON.parse(raw) as { name?: string };
+    const name = parsed?.name?.trim();
+    return name ? name : null;
+  } catch {
+    return null;
+  }
+}