Holiday Trinket: Third Time's a Charm?

Nope.

I got some new solder paste to see if it was the source of the issue:

Fresh paste.

Used the stencil to apply the paste to a new PCB:

Paste applied.

 Placed all the components:

Ready for heating.

Fired up the skillet:

All soldered in place. (I had to manually solder the
center LED as it didn't reflow properly).

And after soldering the battery holder and switch to the back side, I was greeted by this:

More than before! And alternating!

A non-oscillating circuit. I tried to apply different voltages as the supply (since during simulation I realized low voltages could cause the circuit to lock up) and none of them worked. I'll see what else I can do to attempt to debug this later.

Bonus: A picture from the top of Mount Tamalpais from New Years.