probably helps a lot.
Original author's (W2AEW) waveform (at node OUT) with maybe 500mV over 5V:

Original author's soldered version:

Edit 2:
Here's a picture of the overall setup including lead lengths to the PSU and scope:

Edit 3:
And finally, VCC (yellow) and the OUT node (blue) on the scope to show the coinciding ripple:

A:

From the looks of the new scope traces added to the question, specifically the Vcc trace, it appears that the ringing is originating in poor regulation of the supply at the point of use - most likely not at the bench supply output. While shorter leads from the bench power supply will certainly help by reducing lead inductance, that won't be enough when the transition is as sharp as you're looking for.

Add a hefty capacitor on the breadboard acrossFrom Glenn Instapundit Reynolds, writing in The Wall Street Journal:

There's a climate of hate out there, all right, but it doesn't derive from the innocuous use of political clichés. And former Gov. Palin and the tea party movement are more the targets than the source. American journalists know how to be exquisitely sensitive when they want to be. As the Washington Examiner's Byron York pointed out on Sunday, after Major Nidal Hasan shot up Fort Hood while shouting "Allahu Akhbar!" the press was full of cautions about not drawing premature conclusions about a connection to Islamist terrorism. "Where," asked Mr. York, "was that caution after the shootings in Arizona?" Set aside as inconvenient, apparently. There was no waiting for the facts on Saturday. Likewise, last May New York