Chore: Add version consistency check to build process

check_versions.sh

@@ -0,0 +1,19 @@
+#!/bin/bash
+
+# Extract versions
+TS_VERSION=$(grep "const VERSION =" icalendar.ts | cut -d'"' -f2)
+YAML_VERSION=$(grep "version:" icalendar.plug.yaml | head -n 1 | awk '{print $2}')
+PLUG_MD_VERSION=$(grep "version:" PLUG.md | head -n 1 | awk '{print $2}')
+
+echo "Checking versions..."
+echo "icalendar.ts:      $TS_VERSION"
+echo "icalendar.plug.yaml: $YAML_VERSION"
+echo "PLUG.md:           $PLUG_MD_VERSION"
+
+if [ "$TS_VERSION" == "$YAML_VERSION" ] && [ "$YAML_VERSION" == "$PLUG_MD_VERSION" ]; then
+    echo "✅ All versions match."
+    exit 0
+else
+    echo "❌ Version mismatch detected!"
+    exit 1
+fi