Release v0.8.3

Changes from 0.8.2 to 0.8.3

What's Changed

• fix: settle turns when terminal usage is absent by @just-cameron in #309
• docs(examples): run tool-less workflow stages on stateless conversations by @letta-integration[bot] in #312
• feat(cloud): support commit-pinned sandbox repositories by @carenthomas in #313

Full Changelog: v0.8.2...v0.8.3