feat(captcha): LLM text-image OCR solver with strict-retry

internal/captcha/text_test.go

@@ -0,0 +1,33 @@
+package captcha
+
+import (
+	"context"
+	"testing"
+
+	"github.com/lukaszraczylo/captcha-solver-mcp/internal/llm"
+)
+
+func TestSolveText(t *testing.T) {
+	f := &llm.Fake{VisionResp: `{"text":"ab12","confidence":0.9}`}
+	res, err := SolveText(context.Background(), f, []byte{1}, "image/png", TextOptions{})
+	if err != nil {
+		t.Fatal(err)
+	}
+	if res.Text != "ab12" || res.Confidence < 0.89 {
+		t.Fatalf("got %+v", res)
+	}
+	if len(f.VisionCalls) != 1 {
+		t.Fatalf("expected 1 vision call")
+	}
+}
+
+func TestSolveTextRetriesOnGarbage(t *testing.T) {
+	f := &llm.Fake{VisionResp: "I cannot read this"}
+	_, err := SolveText(context.Background(), f, []byte{1}, "image/png", TextOptions{})
+	if err == nil {
+		t.Fatal("want error on unparseable output")
+	}
+	if len(f.VisionCalls) != 2 {
+		t.Fatalf("expected 2 attempts (one retry), got %d", len(f.VisionCalls))
+	}
+}