Letta Code 0.27.29 አውርድ

What's Changed
- fix: retire the node experiment (x-letta-node from LETTA_NODE env only) by @cpacker in https://github.com/letta-ai/letta-code/pull/3262
- fix(channels): keep tool error output out of progress row titles by @cpacker in https://github.com/letta-ai/letta-code/pull/3263
- fix(slack): close orphaned progress streams before starting a new one by @cpacker in https://github.com/letta-ai/letta-code/pull/3267
- fix(listener): keep the model availability cache honest across provider connects (LET-9479) by @cpacker in https://github.com/letta-ai/letta-code/pull/3265
- fix(dream): don't create a placeholder --to doc when nothing is learned by @carenthomas in https://github.com/letta-ai/letta-code/pull/3264
- fix(dream): nudge --to AGENTS.md toward concise, timeless wording by @carenthomas in https://github.com/letta-ai/letta-code/pull/3266
- chore: bump version to 0.27.29 by @github-actions[bot] in https://github.com/letta-ai/letta-code/pull/3269
Full Changelog: https://github.com/letta-ai/letta-code/compare/v0.27.28...v0.27.29