Why: field report two — the final answer collapsed into the process
area (the CF0 long-reply fold swallowed 2000+ char replies and the
model inlines narration, so users saw "everything folded") and the
artifacts workspace panel preview clicks did nothing (the full-screen
overlay stayed up, hiding the rail the preview opened in).
Evidence:
- Conversation.tsx: removed the CF0 LongReplyCollapse entirely — the
final output contract is "the reply to the user is always fully
visible; only process parts fold"; deliverable cards stay pinned
after the reply
- Workspaces.tsx ArtifactsPanel: row click and fullscreen action now
close the workspace overlay before requesting the rail/fullscreen
preview, so the preview is actually on screen
- vitest 40/40, tsc clean; no design-guard regressions (no new colors,
keyframes, or inline font sizes)
Impact: replies are readable in place; ⌘1 panel clicks visibly open
previews; no other surfaces changed.
Refs: task feature/agent-native-deliverables-r1 (backend: artifact
backfill root fix + agent-native deliverables)
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