docs: document LLM extractor adapter usage

README.md

@@ -113,6 +113,29 @@ await db.ingestStatement('Bun makes TypeScript tooling fast.', {
 });
 ```
 
+## LLM-backed extraction
+
+You can bridge any text-generating model into IdentityDB by wrapping it with `LlmFactExtractor`.
+
+```ts
+import { LlmFactExtractor } from 'identitydb';
+
+const extractor = new LlmFactExtractor({
+  model: {
+    async generateText(prompt) {
+      return callYourFavoriteLlm(prompt);
+    },
+  },
+  instructions: 'Prefer technology, product, and time topics over generic nouns.',
+});
+
+await db.ingestStatement('I have worked with Bun and TypeScript since 2025.', {
+  extractor,
+});
+```
+
+The adapter expects the model to return JSON and will validate the structured response before IdentityDB writes a fact.
+
 ## Development
 
 ```bash