Nomad changes

docs/snippets/kotlin/plugins/pdf_only_processor.md

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+```kotlin title="Kotlin"
+import dev.kreuzberg.*
+
+class PdfOnlyProcessor : IPostProcessor {
+    override fun name(): String = "pdf-only-processor"
+    override fun version(): String = "1.0.0"
+
+    override fun process(result: ExtractionResult, config: ExtractionConfig) {
+        // Guard inside process() in addition to should_process() — the gate
+        // saves the JSON roundtrip when this returns false.
+        if (result.mimeType() != "application/pdf") return
+        println("[pdf-only] processing PDF (${result.content().length} chars)")
+    }
+
+    override fun processing_stage(): ProcessingStage = ProcessingStage.Middle
+
+    override fun should_process(
+        _result: ExtractionResult,
+        _config: ExtractionConfig,
+    ): Boolean = _result.mimeType() == "application/pdf"
+
+    override fun estimated_duration_ms(_result: ExtractionResult): Long = 5L
+
+    override fun priority(): Int = 50
+}
+
+fun registerPdfOnlyProcessor() {
+    PostProcessorBridge.registerPostProcessor(PdfOnlyProcessor())
+}
+```