Fix missing compatibility classes and restore CI build

src/main/kotlin/pl/syntaxdevteam/plotsx/loader/SemanticVersion.kt

@@ -0,0 +1,38 @@
+package pl.syntaxdevteam.plotsx.loader
+
+data class SemanticVersion(
+    val major: Int,
+    val minor: Int,
+    val patch: Int
+) : Comparable<SemanticVersion> {
+    override fun compareTo(other: SemanticVersion): Int {
+        return compareValuesBy(
+            this,
+            other,
+            SemanticVersion::major,
+            SemanticVersion::minor,
+            SemanticVersion::patch
+        )
+    }
+
+    override fun toString(): String = "$major.$minor.$patch"
+
+    companion object {
+        private val VERSION_PATTERN = Regex("\\d+(?:\\.\\d+){0,2}")
+
+        fun parse(raw: String): SemanticVersion {
+            val clean = VERSION_PATTERN.find(raw)?.value ?: "0.0.0"
+            val parts = clean.split('.')
+            val major = parts.getOrNull(0)?.toIntOrNull() ?: 0
+            val minor = parts.getOrNull(1)?.toIntOrNull() ?: 0
+            val patch = parts.getOrNull(2)?.toIntOrNull() ?: 0
+            return SemanticVersion(major, minor, patch)
+        }
+    }
+}
+
+fun SemanticVersion.isBetween(start: SemanticVersion, endInclusive: SemanticVersion?): Boolean {
+    if (this < start) return false
+    if (endInclusive == null) return true
+    return this <= endInclusive
+}

src/main/kotlin/pl/syntaxdevteam/plotsx/loader/VersionChecker.kt

@@ -1,7 +1,9 @@
 package pl.syntaxdevteam.plotsx.loader
 
 import org.bukkit.Bukkit
+import pl.syntaxdevteam.core.platform.ServerEnvironment
 import pl.syntaxdevteam.plotsx.PlotsX
+
 class VersionChecker(private val plugin: PlotsX) {
 
     companion object {
@@ -22,7 +24,7 @@ class VersionChecker(private val plugin: PlotsX) {
             SemanticVersion(26, 1, 0),
             SemanticVersion(26, 1, 1),
             SemanticVersion(26, 1, 2),
-            SemanticVersion(26,2,0)
+            SemanticVersion(26, 2, 0)
         )
 
         fun isVersionSupported(version: String): Boolean =
@@ -58,5 +60,3 @@ class VersionChecker(private val plugin: PlotsX) {
         return current >= required
     }
 }
-
-