docs(cli): rewrite README in pt-BR with inspiring narrative

- Transform README from technical to storytelling format
- Add philosophy of vibe coding and agentic AI
- Include real use cases with time savings
- Emphasize customization and flexibility
- Write in Brazilian Portuguese
- Make it inspiring and engaging
- Show the revolution in development with AI

This is a minor bump as it's a significant documentation improvement that changes how users perceive and understand the tool.

Author: cleberhensel

.changeset/improve-cli-readme.md

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+---
+"vibe-devtools": minor
+---
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+Reescrever README completo da CLI em português brasileiro com narrativa inspiradora sobre IA agêntica, vibe coding e ferramentas inteligentes
+