story-kit: queue 73_story_fade_out_completed_agents for QA

.story_kit/work/3_qa/73_story_fade_out_completed_agents.md

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+---
+name: Fade Out Completed Agents in Panel
+test_plan: pending
+---
+
+# "Story 70: Fade Out Completed Agents in Panel"
+
+## User Story
+
+As a user, I want completed agent entries in the Agents panel to gradually fade out and disappear after about 60 seconds, so that the panel doesn't fill up with stale results.
+
+## Acceptance Criteria
+
+- [ ] When an agent reaches a terminal state (completed or failed), a 60-second countdown begins
+- [ ] During the countdown the entry fades from full opacity to zero using a CSS transition
+- [ ] After the fade completes, the entry is removed from the panel DOM
+- [ ] Running and pending agents are never faded or removed
+- [ ] If the user expands a fading entry (clicks the triangle), the fade pauses so they can read the output
+- [ ] Collapsing the entry resumes the fade from where it left off
+
+## Out of Scope
+
+- Persisting completed agent history across page refreshes
+- A "show all completed" toggle to bring back faded entries
+- Configurable fade duration