Nomad changes

docs/snippets/kotlin/plugins/stateful_plugin.md

@@ -0,0 +1,47 @@
+```kotlin title="Kotlin"
+import dev.kreuzberg.*
+import java.util.concurrent.ConcurrentHashMap
+import java.util.concurrent.atomic.AtomicLong
+
+class StatefulPlugin : IPostProcessor {
+    private val callCount = AtomicLong(0)
+    private val cache: ConcurrentHashMap<String, String> = ConcurrentHashMap()
+
+    override fun name(): String = "stateful-plugin"
+    override fun version(): String = "1.0.0"
+
+    override fun initialize() {
+        callCount.set(0)
+        cache.clear()
+    }
+
+    override fun shutdown() {
+        println("Plugin called ${callCount.get()} times")
+        cache.clear()
+    }
+
+    override fun process(result: ExtractionResult, config: ExtractionConfig) {
+        val count = callCount.incrementAndGet()
+        cache["last_mime"] = result.mimeType()
+        cache["last_call"] = count.toString()
+    }
+
+    override fun processing_stage(): ProcessingStage = ProcessingStage.Middle
+
+    override fun should_process(
+        _result: ExtractionResult,
+        _config: ExtractionConfig,
+    ): Boolean = true
+
+    override fun estimated_duration_ms(_result: ExtractionResult): Long = 1L
+
+    override fun priority(): Int = 50
+
+    fun callCount(): Long = callCount.get()
+    fun lastMime(): String? = cache["last_mime"]
+}
+
+fun registerStatefulPlugin() {
+    PostProcessorBridge.registerPostProcessor(StatefulPlugin())
+}
+```