Add CoreAIKit (Swift) usage to the card

README.md

@@ -67,6 +67,20 @@ def score(query, doc, S=512):
 The instruction is swappable per task (the model is instruction-aware). Right-pad is equivalent to
 the upstream left-pad + `logits[:, -1]` (the graph reads the true last token from the mask).
 
+### Swift — [CoreAIKit](https://github.com/john-rocky/coreai-kit)
+
+Downloads this repo on first use and formats the pair in-process:
+
+```swift
+import CoreAIKitEmbeddings
+
+let reranker = try await Reranker(model: .qwen3Reranker0_6B)
+let ranked = try await reranker.rerank(
+    query: "What is the capital of Japan?",
+    documents: ["Tokyo is the capital of Japan.", "Python is a programming language."])
+// ranked[0].document is most relevant; ranked[i].score is P(yes) in [0, 1]
+```
+
 ## Bundle layout
 
 ```