Nomad changes

docs/snippets/php/plugins/embedding_backend.md

@@ -0,0 +1,53 @@
+```php title="PHP"
+<?php declare(strict_types=1);
+
+use Kreuzberg\Kreuzberg;
+
+class MyEmbedder implements EmbeddingBackend {
+    public function name(): string {
+        return "my-embedder";
+    }
+
+    public function version(): string {
+        return "1.0.0";
+    }
+
+    public function initialize(): void {
+        // Initialize the embedding model
+    }
+
+    public function shutdown(): void {
+        // Cleanup resources
+    }
+
+    public function dimensions(): int {
+        return 768;
+    }
+
+    public function embed(array $texts): array {
+        // Delegate to your already-loaded host model
+        // Return array of embedding vectors
+        $embeddings = [];
+        foreach ($texts as $text) {
+            $embeddings[] = array_fill(0, 768, 0.0);
+        }
+        return $embeddings;
+    }
+}
+
+// Register the embedding backend at startup
+$embedder = new MyEmbedder();
+Kreuzberg::registerEmbeddingBackend($embedder);
+
+// Use the registered backend in an EmbeddingConfig
+$config = new EmbeddingConfig();
+$config->model = "my-embedder";
+$config->maxEmbedDurationSecs = 30;
+
+$vectors = Kreuzberg::embedTexts(
+    ["Hello, world!", "Second text"],
+    $config
+);
+
+echo "Generated " . count($vectors) . " embeddings\n";
+```