Make delivery and integration failures explicit

Persist reminder presentations and retry state, atomically complete collapsed deliveries, fall back across away reaches, and block permanent failures visibly (V-715, V-678). Fail closed when enabled integrations lack credentials and keep remote arms explicitly dark (V-691). Give mavweb one sanitized, request-correlated error contract (V-689). Owner explicitly requested direct commits to master.

cmd/mavend/voicewire.go

@@ -377,19 +377,19 @@ func wireVoice(cfg *config.Config, coreAPI ipc.CoreAPI, phr phraser.Phraser, mem
 // degraded mode, so the seam is nil and the cascade routes with the classifier.
 func modelSeam(cfg *config.Config, resident *llm.Client) (router.Completer, *llm.Pair) {
 	if resident == nil {
-		if cfg.Workstation != nil {
+		if cfg.Workstation != nil && !cfg.Workstation.ModelDisabled {
 			log.Printf("voice: a workstation is configured but there is no resident model to floor it with — ignoring the block")
 		}
 		return nil, nil
 	}
-	if cfg.Workstation == nil {
+	if cfg.Workstation == nil || cfg.Workstation.ModelDisabled {
 		return resident, nil
 	}
 	ws := cfg.Workstation
 	remote := llm.New(ws.URL, time.Duration(ws.Timeout))
 	remote.SetToken(ws.Token)
 	if ws.Token == "" {
-		log.Printf("voice: no workstation.token — mavgpud refuses an unauthenticated request, so this reads as a card that is always busy")
+		log.Printf("voice: unauthenticated workstation model endpoint is loopback-only")
 	}
 	pair := llm.NewPair(
 		remote,
@@ -434,7 +434,7 @@ func sttSeam(cfg *config.Config, floor stt.Transcriber) (stt.Transcriber, *stt.P
 	)
 	pair.Start(context.Background())
 	if s.Token == "" {
-		log.Print("voice: the workstation transcriber has no token, so anything on the LAN can post audio to it")
+		log.Print("voice: unauthenticated workstation transcriber endpoint is loopback-only")
 	}
 	log.Printf("voice: workstation transcriber at %s, probed every %s, mavsttd as the floor",
 		s.URL, time.Duration(s.Probe))