chore: Add Renovate configuration for automated dependency updates (#22)

Author: roottool

.github/renovate.json

@@ -0,0 +1,17 @@
+{
+	"$schema": "https://docs.renovatebot.com/renovate-schema.json",
+	"extends": ["config:best-practices"],
+	"timezone": "Asia/Tokyo",
+	"schedule": ["before 5am on Monday"],
+	"labels": ["dependencies"],
+	"lockFileMaintenance": {
+		"enabled": true,
+		"schedule": ["before 5am on Monday"]
+	},
+	"packageRules": [
+		{
+			"matchUpdateTypes": ["patch", "minor"],
+			"automerge": true
+		}
+	]
+}

package.json

@@ -56,9 +56,6 @@
 		"check:package": "publint && attw --pack . --ignore-rules cjs-resolves-to-esm",
 		"prepublishOnly": "bun run check:type && bun run test:coverage && bun run build && bun run check:package"
 	},
-	"engines": {
-		"node": "^20.19.0 || >= 22.12.0"
-	},
 	"devDependencies": {
 		"@arethetypeswrong/cli": "0.18.2",
 		"@biomejs/biome": "2.3.10",