Yes it does. Article I, Section 1 states "All legislative Powers herein granted shall be vested in a Congress of the United States"
So tell me, Dan, exactly what is so difficult to understand about the phrase "SHALL BE VESTED IN A CONGRESS OF THE UNITED STATES"?
Does the "suspension clause," itself, require a legislative act? No.
Thank you. I saw that, too, but didn't think to quote it.
The location of the mention of suspension of habeas corpus in Article I, Section 1 is dispositive IMHO.