Patch Changes
- c3806f8: fix: do not export internal Runtime types
- 899b963: refactor: add BaseThreadRuntimeCore class
- 899b963: feat: work towards Edit Composer attachment support
- 899b963: refactor: remove composerState.attachmentAccept, add composerRuntime.getAttachmentAccept()
- 8c80f2a: feat: MessageState.submittedFeedback state
- 809c5c1: feat: New Attachment UI