feat: Add AgentBar arc dock with per-agent terminal frame and voice modal

- Add ui.json configs for Main (purple) and Ejecutor (red) agents
- AgentBar: fused arc-shaped dock at bottom with dynamic glow
- Quick press opens styled terminal frame mockup
- Hold opens voice modal with Web Speech API streaming transcription
- Responsive: full-width mobile, max-width on tablet/desktop/4K
- Agents API: serve uiConfig from ui.json in agent directories
- Agents page: route, store, toolbar integration

.claude-ejecutor/plugins/known_marketplaces.json

@@ -5,6 +5,6 @@
       "repo": "anthropics/claude-plugins-official"
     },
     "installLocation": "C:\\Users\\jodar\\agent-ui\\.claude-ejecutor\\plugins\\marketplaces\\claude-plugins-official",
-    "lastUpdated": "2026-02-15T04:49:09.493Z"
+    "lastUpdated": "2026-02-15T08:27:07.485Z"
   }
 }