Why: the merge commit left tsc broken in two spots - an artifact.created
handler still pushing to the removed LiveState.parts, and main's newer ui
icons not yet checked out in this worktree; also Part was imported unused.
Evidence: artifact.created now appends an artifact LiveItem (process=true,
matching the backend's ae8e5d0) projected to artifact_ref by
liveToMessage; new test asserts it lands after its tool call. tsc -b exit
0 after initializing the ui submodule checkout; vitest 33/33.
Impact: live artifact chips render inside the process stream and fold on
reconcile; no functional change elsewhere.
Refs: feature/chat-process-split-r1
weichen
64837575a9