Revamp README and remove emojis from documentation
Rewrite README.md with professional, concise structure:
- Add explicit platform support and requirements sections
- Add architecture diagram showing module pipeline
- Create documentation index table linking to docs/
- Remove duplicate content (point to AGENTS.md for dev details)
- Update tagline to "Navigate Life Intelligently"
Remove all emojis from AGENTS.md section headers for consistency.
Add .env.example with documented configuration template.
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Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>