Accept story 59: Animated Agent Work Assignment UI

Agent lozenges on work items with pulse animations, idle/active
state in agents panel, pipeline state includes agent assignments.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

.story_kit/work/4_merge/59_story_current_work_panel.md

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-name: Animated Agent Work Assignment UI
-test_plan: pending
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-
-# 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