fix: address additional PR review feedback
- Remove hardcoded API key, use Anthropic() with env auto-detection
- Fix pip install to use %%capture magic per project standards
- Add return type annotation to remove_thinking_blocks function
- Remove redundant 'What You'll Learn' section (duplicates Learning Objectives)
- Clean up duplicate cells from previous edits
:house: Remote-Dev: homespace
Claude-Generated-By: Claude Code (cli/claude-opus-4-5=100%)
Claude-Steers: 1
Claude-Permission-Prompts: 13
Claude-Escapes: 0
