docs(quickstart): fix prerequisites, add venv step, correct CLI flags

[goldmedal]

Summary

• Add Step 0 for Python venv setup; remove per-project venv from Step 1
• Bump Python requirement from 3.9+ to 3.11+ (matches pyproject.toml)
• Add Node.js/npm to prerequisites (conditional, for npx only)
• Fix wren memory fetch/recall flag from --question to --query
• Add missing format: duckdb to --from-file profile example
• Remove redundant manual wren_project.yml edit in Step 5 (handled by generate-mdl skill)
• Remove incorrect note about restarting Claude Code session after skill install

Test plan

• Verify quickstart renders correctly on GitHub
• Walk through the quickstart end-to-end with a fresh venv

🤖 Generated with Claude Code

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