v0.4.0

What's Changed

• feat(masking): implement MaskingSpanExporter using public OTEL APIs by @hashirventhodi in #13
• chore: code quality cleanup, Python 3.9 compatibility, and dependency updates by @hashirventhodi in #14
• feat(wrappers): add multi-provider LLM wrapper support and integration infrastructure by @hashirventhodi in #15
• refactor(wrappers): extract shared infrastructure and add multi-provider support by @hashirventhodi in #16
• feat(client): add async-safe context management and Jupyter notebook compatibility by @hashirventhodi in #17
• docs: clean up documentation and code comments by @hashirventhodi in #18
• feat(evaluation): add evaluation framework with pre-built scorers and annotation queues by @hashirventhodi in #19

Full Changelog: v0.3.3...v0.4.0