selfupdate: report progress events; reports carry update stage, percent and log

Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>

model/model.go

@@ -308,6 +308,10 @@ type EdgeReport struct {
 	AutoUpdate bool                     `json:"autoUpdate,omitempty"`
 	UpdateMsg  string                   `json:"updateMsg,omitempty"` // outcome of the update asked for by UpdateID
 	UpdateID   string                   `json:"updateId,omitempty"`
+	// progress of that update, for the dashboard's progress bar and log
+	UpdateStage string   `json:"updateStage,omitempty"`
+	UpdatePct   int      `json:"updatePct,omitempty"`
+	UpdateLog   []string `json:"updateLog,omitempty"`
 }
 
 // EdgeRef tells a site where to dial.
@@ -340,6 +344,10 @@ type SiteReport struct {
 	AutoUpdate bool              `json:"autoUpdate,omitempty"`
 	UpdateMsg  string            `json:"updateMsg,omitempty"`
 	UpdateID   string            `json:"updateId,omitempty"`
+	// progress of that update, for the dashboard's progress bar and log
+	UpdateStage string   `json:"updateStage,omitempty"`
+	UpdatePct   int      `json:"updatePct,omitempty"`
+	UpdateLog   []string `json:"updateLog,omitempty"`
 }
 
 // HostMatches reports whether host matches an exact name or a "*.example.com" pattern.