Add usage commands, a vendor-neutral usage format and a knowledge base

internal/agents/antigravity.go

@@ -153,7 +153,6 @@ func (m *Manager) agyTurnEnded(ctx context.Context, l *live, p antigravityProces
 	m.mu.Lock()
 	final := l.lastText
 	m.mu.Unlock()
-	go m.readAgyRateLimit()
 
 	success := res.Status == "SUCCESS"
 	bounce := false
@@ -207,30 +206,17 @@ func (m *Manager) readAgyRateLimit() {
 		slog.Error("read antigravity rate limits", "err", err)
 		return
 	}
-	m.mu.Lock()
-	m.rateLimits[api.Antigravity] = agyRateLimit(groups)
-	m.mu.Unlock()
-	m.store.Broadcast(api.Event{Kind: "admin.health", Actor: "byre", Payload: map[string]any{}})
+	m.setVendorUsage(api.Antigravity, agyUsage(groups))
 }
 
-func agyRateLimit(groups []antigravity.UsageGroup) map[string]any {
-	info := map[string]any{"status": "allowed"}
-	windows := map[string]any{}
+func agyUsage(groups []antigravity.UsageGroup) api.Usage {
+	u := api.Usage{UpdatedAt: time.Now(), Windows: []api.UsageWindow{}}
 	for _, g := range groups {
 		for _, b := range g.Buckets {
-			window := map[string]any{"utilization": 1 - b.RemainingFraction, "resetsAt": b.ResetTime.Unix()}
-			if mins := agyWindowMins[b.Window]; mins != 0 {
-				window["windowMins"] = mins
-			}
-			windows[b.ID] = window
-			if b.RemainingFraction <= 0 {
-				info["status"] = "rejected"
-				info["rateLimitType"] = b.ID
-			}
+			u.Windows = append(u.Windows, percentWindow(b.ID, 1-b.RemainingFraction, b.ResetTime.Unix(), int64(agyWindowMins[b.Window])*60))
 		}
 	}
-	info["unifiedWindows"] = windows
-	return info
+	return u
 }
 
 func (m *Manager) agyBeforeModel(l *live) antigravity.HookFunc {