mavweb: add notifications history page at /notifications

RecentNudges IPC method, store adapter, dispatch, and client proxy.
Web UI at /notifications showing recent nudge history with color-coded
outcomes, nav links from /dash and /history.

cmd/mavweb/main.go

@@ -51,6 +51,9 @@ var historyHTML string
 //go:embed trace.html
 var traceHTML string
 
+//go:embed notifications.html
+var notificationsHTML string
+
 // dashTmpl — the monitoring read surface, server-rendered from dash.html (no JS,
 // no client fetch); meta-refresh keeps it live. html/template escapes the user
 // text in facts/nudges. Read-only: browses the append-only store via CoreAPI,
@@ -139,6 +142,9 @@ func main() {
 	mux.HandleFunc("/trace", func(w http.ResponseWriter, r *http.Request) {
 		handleTrace(w, r, core)
 	})
+	mux.HandleFunc("/notifications", func(w http.ResponseWriter, r *http.Request) {
+		handleNotifications(w, r, core)
+	})
 	mux.HandleFunc("/api/revert", func(w http.ResponseWriter, r *http.Request) {
 		handleRevert(w, r, core)
 	})
@@ -378,6 +384,8 @@ input[type=text]{width:22rem}code{background:#f4f4f4;padding:.1rem .3rem}
 
 var historyTmpl = template.Must(template.New("history").Parse(historyHTML))
 
+var notificationsTmpl = template.Must(template.New("notifications").Parse(notificationsHTML))
+
 var traceTmpl = template.Must(template.New("trace").Funcs(template.FuncMap{
 	"ago": func(t time.Time) string {
 		if t.IsZero() {
@@ -414,6 +422,24 @@ func handleHistory(w http.ResponseWriter, r *http.Request, core ipc.CoreAPI) {
 	}
 }
 
+func handleNotifications(w http.ResponseWriter, r *http.Request, core ipc.CoreAPI) {
+	if core == nil {
+		http.Error(w, "notifications disabled (no -core)", http.StatusServiceUnavailable)
+		return
+	}
+	ctx := r.Context()
+	nudges, err := core.RecentNudges(ctx, 50)
+	if err != nil {
+		log.Printf("notifications: %v", err)
+		http.Error(w, "notifications error: "+err.Error(), http.StatusBadGateway)
+		return
+	}
+	w.Header().Set("Content-Type", "text/html; charset=utf-8")
+	if err := notificationsTmpl.Execute(w, map[string]any{"Nudges": nudges}); err != nil {
+		log.Printf("notifications template: %v", err)
+	}
+}
+
 func handleTrace(w http.ResponseWriter, r *http.Request, core ipc.CoreAPI) {
 	if core == nil {
 		http.Error(w, "trace disabled (no -core)", http.StatusServiceUnavailable)