chore: align Node 26.7.0 toolchain

scripts/check-node-toolchain.mjs

@@ -0,0 +1,39 @@
+import assert from "node:assert/strict";
+import { readFileSync } from "node:fs";
+import { dirname, resolve } from "node:path";
+import { fileURLToPath } from "node:url";
+
+const projectRoot = resolve(dirname(fileURLToPath(import.meta.url)), "..");
+const readProjectFile = (path) =>
+	readFileSync(resolve(projectRoot, path), "utf8");
+
+const pinnedVersion = readProjectFile(".nvmrc").trim();
+assert.match(
+	pinnedVersion,
+	/^\d+\.\d+\.\d+$/,
+	".nvmrc must pin an exact Node.js version",
+);
+
+const major = Number.parseInt(pinnedVersion.split(".")[0], 10);
+const packageJson = JSON.parse(readProjectFile("package.json"));
+
+assert.equal(
+	packageJson.engines?.node,
+	`>=${pinnedVersion} <${major + 1}`,
+	"package.json engines.node must match the .nvmrc release line",
+);
+assert.equal(
+	Number.parseInt(packageJson.devDependencies?.["@types/node"], 10),
+	major,
+	"@types/node must match the pinned Node.js major",
+);
+
+if (!process.argv.includes("--static")) {
+	assert.equal(
+		process.versions.node,
+		pinnedVersion,
+		"the active Node.js runtime must match .nvmrc",
+	);
+}
+
+console.log(`Node.js toolchain is aligned on ${pinnedVersion}`);