test(e2e): solve_grid over real MCP stdio with fake LLM

test/e2e/fakellm_test.go

@@ -0,0 +1,23 @@
+//go:build e2e
+
+package e2e
+
+import (
+	"io"
+	"net/http"
+	"net/http/httptest"
+)
+
+// startFakeLLM returns an OpenAI-compatible endpoint that always selects tiles 0,1,2.
+func startFakeLLM() *httptest.Server {
+	return httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		switch r.URL.Path {
+		case "/v1/chat/completions":
+			_, _ = io.WriteString(w, `{"choices":[{"message":{"content":"{\"tiles\":[0,1,2],\"confidence\":0.95,\"recheck_recommended\":false}"}}]}`)
+		case "/v1/audio/transcriptions":
+			_, _ = io.WriteString(w, `{"text":"fortytwo"}`)
+		default:
+			http.NotFound(w, r)
+		}
+	}))
+}