v1.21.1

What's Changed

• Fix release workflow dispatch token by @xingyaoww in #3106
• feat(workspace): Add completion callback support to RemoteWorkspace by @malhotra5 in #3110
• fix(sdk): mark iterative refinement as critical setting by @xingyaoww in #3115
• Add optional ref query param to /api/git/{changes,diff} by @rbren in #3116
• Add tini init to Dockerfile to reap zombie processes by @neubig in #3043
• Fix unhandled GitRepositoryError on GET /api/git/changes by @neubig in #3041
• Fix orphaned Laminar traces from cross-async-context conversations by @neubig in #3113
• Release v1.21.1 by @all-hands-bot in #3130

Full Changelog: v1.21.0...v1.21.1