feat(crew): accept rig name as positional arg in crew status

Allow `gt crew status <rig>` to work without requiring --rig flag.
This matches the pattern already used by crew start and crew stop.

Desire path: hq-v33hb

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

internal/cmd/crew_status.go

@@ -40,6 +40,13 @@ func runCrewStatus(cmd *cobra.Command, args []string) error {
 				crewRig = rig
 			}
 			targetName = crewName
+		} else if crewRig == "" {
+			// Check if single arg (without "/") is a valid rig name
+			// If so, show status for all crew in that rig
+			if _, _, err := getRig(targetName); err == nil {
+				crewRig = targetName
+				targetName = "" // Show all crew in the rig
+			}
 		}
 	}