Add local JSON daemon and route TUI/CLI through it.

A per-DataDir background process owns ticket JSON, history, and sync so
multiple TUI instances stay consistent; MCP token APIs are ready for phase 2.

Co-authored-by: Cursor <cursoragent@cursor.com>

internal/daemon/api/hub.go

@@ -0,0 +1,81 @@
+package api
+
+import (
+	"encoding/json"
+	"fmt"
+	"net/http"
+	"sync"
+)
+
+// Event is a change notification pushed to SSE clients.
+type Event struct {
+	Type      string `json:"type"`
+	ProjectID string `json:"projectId,omitempty"`
+}
+
+type hub struct {
+	mu      sync.Mutex
+	clients map[chan Event]struct{}
+}
+
+func newHub() *hub {
+	return &hub{clients: map[chan Event]struct{}{}}
+}
+
+func (h *hub) subscribe() chan Event {
+	ch := make(chan Event, 16)
+	h.mu.Lock()
+	h.clients[ch] = struct{}{}
+	h.mu.Unlock()
+	return ch
+}
+
+func (h *hub) unsubscribe(ch chan Event) {
+	h.mu.Lock()
+	delete(h.clients, ch)
+	h.mu.Unlock()
+	close(ch)
+}
+
+func (h *hub) publish(ev Event) {
+	h.mu.Lock()
+	defer h.mu.Unlock()
+	for ch := range h.clients {
+		select {
+		case ch <- ev:
+		default:
+		}
+	}
+}
+
+func (s *Server) handleEvents(w http.ResponseWriter, r *http.Request) {
+	flusher, ok := w.(http.Flusher)
+	if !ok {
+		http.Error(w, "streaming unsupported", http.StatusInternalServerError)
+		return
+	}
+	w.Header().Set("Content-Type", "text/event-stream")
+	w.Header().Set("Cache-Control", "no-cache")
+	w.Header().Set("Connection", "keep-alive")
+
+	ch := s.hub.subscribe()
+	defer s.hub.unsubscribe(ch)
+
+	fmt.Fprintf(w, ": ok\n\n")
+	flusher.Flush()
+
+	ctx := r.Context()
+	for {
+		select {
+		case <-ctx.Done():
+			return
+		case ev, ok := <-ch:
+			if !ok {
+				return
+			}
+			data, _ := json.Marshal(ev)
+			fmt.Fprintf(w, "data: %s\n\n", data)
+			flusher.Flush()
+		}
+	}
+}