chore: configure releases and develop workflow

scripts/check-release.cjs

@@ -0,0 +1,25 @@
+const assert = require("node:assert/strict");
+const { execFileSync } = require("node:child_process");
+const { version } = require("../package.json");
+const git = (...args) => execFileSync("git", args, { encoding: "utf8" }).trim();
+
+assert.equal(
+	git("status", "--porcelain"),
+	"",
+	"Commit all changes before preparing a release",
+);
+const tags = git(
+	"tag",
+	"--merged",
+	"HEAD",
+	"--list",
+	"v[0-9]*",
+	"--sort=-version:refname",
+)
+	.split("\n")
+	.filter((tag) => /^v\d+\.\d+\.\d+$/.test(tag));
+assert.equal(
+	version,
+	tags[0]?.slice(1) ?? "0.0.0",
+	"Version is already prepared or release tags are missing. Fetch tags; finish the existing release before preparing another.",
+);