[HANDS-ON BUG] Unit 2 smolagents final quiz Space is broken (404)

**Describe the bug** The final quiz in Unit 2 smolagents is completely broken. The embedded iframe points to a HuggingFace Space that returns 404. **To Reproduce** 1. Go to https://huggingface.co/learn/agents-course/unit2/smolagents/final_quiz 2. The quiz iframe fails to load 3. The Space URL `https://agents-course-unit2-smolagents-quiz.hf.space` returns 404 (page not found) Previously when partially accessible, it also threw: `410 Client Error: Gone — api-inference.huggingface.co is no longer supported, please use router.huggingface.co instead` **Screenshots** [attach your screenshots here] **Additional context** The Space appears to have been deleted or moved. All learners are currently unable to complete the Unit 2 smolagents final quiz.