Remove the "agents-at-work" list section from AgentPanel. The roster
badges with flying lozenge animations already convey which agents are
active, making the redundant list unnecessary.
- Remove StatusBadge, DiffCommand, EditorCommand components
- Remove expandedKey, logEndRefs, fade-timer state and effects
- Remove handleStop (no more Stop buttons)
- Keep agents state + SSE subscriptions (roster badges still need it)
- Delete diff-command and fade-out tests (feature removed)
- Add test asserting no agent-entry divs are rendered
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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