fix: suppress misleading 'Using Q8 WASM' log when Cortex native is active

EmbeddingManager constructor logged 'Using Q8 precision (WASM)' before
plugins had a chance to register a native embedder. Deferred logging to
init() so the startup message reflects the actual embedding engine.

src/embeddings/EmbeddingManager.ts

@@ -48,7 +48,8 @@ export class EmbeddingManager {
 
   private constructor() {
     this.engine = WASMEmbeddingEngine.getInstance()
-    console.log('🎯 EmbeddingManager: Using Q8 precision (WASM)')
+    // Log deferred to init() — at construction time we don't know if a plugin
+    // (like Cortex) will replace the WASM embedder with a native one.
   }
 
   /**