feat: add orchestrator observability to Mission Control

Add real-time visibility into the parallel orchestrator's decisions
and state in the Mission Control UI. The orchestrator now has its
own avatar ("Maestro") and displays capacity/queue information.

Backend changes (server/websocket.py):
- Add OrchestratorTracker class that parses orchestrator stdout
- Define regex patterns for key orchestrator events (spawn, complete, capacity)
- Track coding/testing agent counts, ready queue, blocked features
- Emit orchestrator_update WebSocket messages
- Reset tracker state when agent stops or crashes

Frontend changes:
- Add OrchestratorState, OrchestratorStatus, OrchestratorEvent types
- Add WSOrchestratorUpdateMessage to WSMessage union
- Handle orchestrator_update in useWebSocket hook
- Create OrchestratorAvatar component (Maestro - robot conductor)
- Create OrchestratorStatusCard with capacity badges and event ticker
- Update AgentMissionControl to show orchestrator above agent cards
- Add conducting/baton-tap CSS animations for Maestro

The orchestrator status card shows:
- Maestro avatar with state-based animations
- Current orchestrator state and message
- Coding agents, testing agents, ready queue badges
- Blocked features count (when > 0)
- Collapsible recent events list

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

ui/src/App.tsx

@@ -348,14 +348,13 @@ function App() {
               isConnected={wsState.isConnected}
             />
 
-            {/* Agent Mission Control - shows active agents in parallel mode */}
-            {wsState.activeAgents.length > 0 && (
-              <AgentMissionControl
-                agents={wsState.activeAgents}
-                recentActivity={wsState.recentActivity}
-                getAgentLogs={wsState.getAgentLogs}
-              />
-            )}
+            {/* Agent Mission Control - shows orchestrator status and active agents in parallel mode */}
+            <AgentMissionControl
+              agents={wsState.activeAgents}
+              orchestratorStatus={wsState.orchestratorStatus}
+              recentActivity={wsState.recentActivity}
+              getAgentLogs={wsState.getAgentLogs}
+            />
 
             {/* Agent Thought - shows latest agent narrative (single agent mode) */}
             {wsState.activeAgents.length === 0 && (