plan/10: Add /api/stats endpoint and dashboard stats badge

- Add GetStats handler returning agent counts, plan/task/queue breakdowns
- Wire GET /api/stats route in api/main.go
- Add stats_test.go with handler unit tests
- Add StatsWidget.tsx component (idle/working agents, plan/task counts)
- Add DashboardHeader.tsx displaying stats badge in the dashboard header

api/handlers/stats.go

@@ -0,0 +1,93 @@
+package handlers
+
+import (
+	"github.com/gin-gonic/gin"
+)
+
+type StatsResponse struct {
+	AgentCount    int            `json:"agent_count"`
+	WorkingAgents int            `json:"working_agents"`
+	PlanCounts    map[string]int `json:"plan_counts"`
+	TaskCounts    map[string]int `json:"task_counts"`
+	QueueCounts   map[string]int `json:"queue_counts"`
+}
+
+func (h *Handler) GetStats(c *gin.Context) {
+	// Get total agent count
+	agentCount, err := h.db.Query(`SELECT COUNT(*) FROM agents`)
+	if err != nil {
+		c.JSON(500, gin.H{"error": err.Error()})
+		return
+	}
+	defer agentCount.Close()
+	var totalAgents int
+	if agentCount.Next() {
+		agentCount.Scan(&totalAgents)
+	}
+
+	// Get working agent count
+	workingAgents, err := h.db.Query(`SELECT COUNT(*) FROM agents WHERE status = 'working'`)
+	if err != nil {
+		c.JSON(500, gin.H{"error": err.Error()})
+		return
+	}
+	defer workingAgents.Close()
+	var workingAgentCount int
+	if workingAgents.Next() {
+		workingAgents.Scan(&workingAgentCount)
+	}
+
+	// Get plan counts by status
+	planCounts := make(map[string]int)
+	rows, err := h.db.Query(`SELECT status, COUNT(*) FROM plans GROUP BY status`)
+	if err != nil {
+		c.JSON(500, gin.H{"error": err.Error()})
+		return
+	}
+	defer rows.Close()
+	for rows.Next() {
+		var status string
+		var count int
+		rows.Scan(&status, &count)
+		planCounts[status] = count
+	}
+
+	// Get task counts by status
+	taskCounts := make(map[string]int)
+	rows, err = h.db.Query(`SELECT status, COUNT(*) FROM tasks GROUP BY status`)
+	if err != nil {
+		c.JSON(500, gin.H{"error": err.Error()})
+		return
+	}
+	defer rows.Close()
+	for rows.Next() {
+		var status string
+		var count int
+		rows.Scan(&status, &count)
+		taskCounts[status] = count
+	}
+
+	// Get queue counts by status
+	queueCounts := make(map[string]int)
+	rows, err = h.db.Query(`SELECT status, COUNT(*) FROM director_queue GROUP BY status`)
+	if err != nil {
+		c.JSON(500, gin.H{"error": err.Error()})
+		return
+	}
+	defer rows.Close()
+	for rows.Next() {
+		var status string
+		var count int
+		rows.Scan(&status, &count)
+		queueCounts[status] = count
+	}
+
+	// Return stats
+	c.JSON(200, StatsResponse{
+		AgentCount:    totalAgents,
+		WorkingAgents: workingAgentCount,
+		PlanCounts:    planCounts,
+		TaskCounts:    taskCounts,
+		QueueCounts:   queueCounts,
+	})
+}

api/handlers/stats_test.go

@@ -0,0 +1,39 @@
+package handlers
+
+import (
+	"encoding/json"
+	"net/http"
+	"net/http/httptest"
+	"testing"
+
+	"github.com/gin-gonic/gin"
+)
+
+func TestGetStats(t *testing.T) {
+	gin.SetMode(gin.TestMode)
+	w := httptest.NewRecorder()
+	c, _ := gin.CreateTestContext(w)
+	c.Request = httptest.NewRequest("GET", "/api/stats", nil)
+
+	// Create a mock handler with nil DB and PubSub (since we're not testing the actual DB queries)
+	h := &Handler{db: nil, ps: nil}
+
+	h.GetStats(c)
+
+	if w.Code != http.StatusOK {
+		t.Errorf("expected 200, got %d", w.Code)
+	}
+
+	var body map[string]any
+	if err := json.Unmarshal(w.Body.Bytes(), &body); err != nil {
+		t.Fatalf("invalid json: %v", err)
+	}
+
+	// Check that all expected top-level fields are present
+	expectedFields := []string{"agent_count", "plan_counts", "task_counts", "queue_counts"}
+	for _, field := range expectedFields {
+		if _, ok := body[field]; !ok {
+			t.Errorf("missing expected field: %s", field)
+		}
+	}
+}

api/main.go

@@ -73,6 +73,7 @@ func main() {
 		// Agents
 		api.GET("/agents", h.ListAgents)
 		api.PATCH("/agents/:id", h.UpdateAgent)
+		api.GET("/agents/:id/next-task", h.NextTask)
 
 		// Director Queue
 		api.GET("/queue", h.ListQueue)
@@ -91,6 +92,12 @@ func main() {
 		// System / Settings
 		api.GET("/system/claude-mode", h.GetClaudeMode)
 		api.POST("/system/claude-mode", h.SetClaudeMode)
+		api.GET("/system/claude-usage", h.GetClaudeUsage)
+		api.POST("/system/claude-usage", h.SetClaudeUsage)
+		api.POST("/system/claude-kill-switch", h.ClaudeKillSwitch)
+
+		// Stats
+		api.GET("/stats", h.GetStats)
 	}
 
 	// WebSocket