- Remove all emoji from CONTRIBUTING.md, CODE_OF_CONDUCT.md, and PR template
- Add Rust to prerequisites
- Update PostgreSQL requirement to include pgvector extension
- Add playbook-builder to services and development startup
- Remove non-existent api-server from project structure
- Clarify vector database requirements for embeddings
- Add CONTRIBUTING.md with complete development setup and guidelines
- Add CODE_OF_CONDUCT.md for community standards
- Add PR template in .github/pull_request_template.md