v0.2.0

Release v0.2.0

Features:
- Comprehensive CLI UX improvements (global flags, dry-run, shell completion, JSON output)
- Enhanced validate, delete, list, init, and doctor commands

Bug Fixes:
- Comprehensive bug hunt (Critical through Low severity)
- Dataset path config and undeclared provider dependencies
- Hallucination test fixture deepeval module replacement
- CLI ANSI code stripping in tests and --no-interactive flag

Documentation:
- Provider guides for all LLM, retriever, and embedder providers
- Examples section with RAG tutorial guide
- CLI improvements documentation