story-kit: start 59_story_current_work_panel

.story_kit/work/2_current/59_story_current_work_panel.md

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+---
+name: Animated Agent Work Assignment UI
+test_plan: pending
+---
+
+# Story 59: Animated Agent Work Assignment UI
+
+## User Story
+
+As a user watching the web UI, I want to see which agent is working on which work item across all active pipeline stages, with agents visually animating between idle and assigned states, so the pipeline feels like a living system I can watch in real time.
+
+## Acceptance Criteria
+
+- [ ] Work items in current/qa/merge panels each show which agent (if any) is working on them
+- [ ] Agent lozenges (e.g. "coder-1 sonnet") visually animate from the agents panel to the work item they are assigned to
+- [ ] When an agent completes, its lozenge animates back to idle in the agents panel (or to the next work item if immediately reassigned)
+- [ ] Idle agents are visible in the agents panel with an idle state indicator
+- [ ] Active agents show a subtle activity indicator (pulse, shimmer, etc.) on the work item they are docked to
+- [ ] Pipeline state and agent assignments update in real time via WebSocket — no manual refresh needed
+- [ ] The backend exposes agent-to-story assignments as part of the pipeline state (agent pool already tracks this)
+
+## Out of Scope
+
+- Actions from the UI (stop agent, reassign, start agent) — future story
+- Agent output streaming in the work item card — existing agent panel handles this