הורדת Letta Code 0.29.12

What's Changed
- chore: upgrade pi-ai for Claude Opus 5 by @sarahwooders in https://github.com/letta-ai/letta-code/pull/3550
- fix(channels): route shared reload command by @overlord-letta in https://github.com/letta-ai/letta-code/pull/3528
- fix(slack): avoid repeated bot thread context by @devanshrj in https://github.com/letta-ai/letta-code/pull/3551
- fix(channels): compact persisted channel reminders by @devanshrj in https://github.com/letta-ai/letta-code/pull/3552
- fix(slack): enforce loading message limit by @cpacker in https://github.com/letta-ai/letta-code/pull/3553
- feat(mcp): add per-agent client-side MCP with OAuth by @letta-integration[bot] in https://github.com/letta-ai/letta-code/pull/3549
- fix(mcp): publish reusable client declarations by @letta-integration[bot] in https://github.com/letta-ai/letta-code/pull/3557
- chore: bump version to 0.29.12 by @github-actions[bot] in https://github.com/letta-ai/letta-code/pull/3558
Full Changelog: https://github.com/letta-ai/letta-code/compare/v0.29.11...v0.29.12