Assign sequential pod IDs from the master with NVS-stable bindings.

Replaces MAC-byte self-IDs with master allocation (1–255), slave preferred-ID reconnect, debug reset via UART/UI, and rate-limited ASSIGN to avoid ESP-NOW NO_MEM storms.

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

goTool/autotest/config.go

@@ -84,13 +84,7 @@ func NewBench(cfg Config) (*Bench, error) {
 			return nil, fmt.Errorf("config %q slave %q: %w", cfg.ID, s.ID, err)
 		}
 		s.MAC = mac
-		if s.ClientID == nil {
-			parts := strings.Split(mac, ":")
-			var last byte
-			fmt.Sscanf(parts[5], "%02x", &last)
-			id := uint(last)
-			s.ClientID = &id
-		}
+		/* client_id is master-assigned (sequential); omit until known from `gotool clients`. */
 		b.slaveByID[s.ID] = s
 	}
 	return b, nil
@@ -112,6 +106,9 @@ func (b *Bench) ResolveClientID(slaveID string) (uint32, error) {
 	if err != nil {
 		return 0, err
 	}
+	if s.ClientID == nil {
+		return 0, fmt.Errorf("slave %q: client_id required (master-assigned; set in config after join)", slaveID)
+	}
 	return uint32(*s.ClientID), nil
 }