Why: Status words shared with a final reply could suppress a child completion record.
Evidence: 272 frontend unit tests, build, and 15 isolated browser scenarios.
Impact: Tag client-side collaboration replay so partial-delta deduplication preserves agent notes.
Refs: Agent-System-Dev feature/work-companion-visibility UI1
Why: A dropped delta batch can leave a short event prefix next to the complete saved message.
Evidence: 271 frontend unit tests, build, and 14 isolated browser scenarios.
Impact: Suppress overlapping partial replay text and thinking while retaining saved content.
Refs: Agent-System-Dev feature/work-companion-visibility UI1
Why: Event replay could hide saved retry notes and leave completed cards outside the active work filter.
Evidence: 270 frontend unit tests, build, and 14 isolated browser scenarios.
Impact: Merge replay into saved history, retain child progress, and locate cards under the right scope.
Refs: Agent-System-Dev feature/work-companion-visibility UI1 UI2
Why: Fast and slow channel cards duplicate across panes and completed replies hide process output.
Evidence: npm test; npm run build; 12 isolated Playwright scenarios with reload and responsive widths.
Impact: Preserve ordered folded process history, load durable run events, and give work cards one detailed pane.
Refs: Agent-System-Dev feature/work-companion-visibility UI1 UI2 UI3
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