0.6.39

## What's Changed
* fix(load-directory): Fix up file extension comparison & path list construction by @kk-src in https://github.com/letta-ai/letta/pull/2458
* Add latest tags to Anthropic models by @wsargent in https://github.com/letta-ai/letta/pull/2477
* fix: Spurious empty chunk warning on Claude by @wsargent in https://github.com/letta-ai/letta/pull/2476
* fix: bug fixes by @mattzh72 in https://github.com/letta-ai/letta/pull/2479
* feat: mcp support + version bump by @sarahwooders in https://github.com/letta-ai/letta/pull/2480

## New Contributors
* @wsargent made their first contribution in https://github.com/letta-ai/letta/pull/2477

**Full Changelog**: https://github.com/letta-ai/letta/compare/0.6.37...0.6.39