Help identify a volunteer

[PdxMatos]

My neighbor showed me a plant, that was interesting, and I would like help identifying it.
It was not intentionally planted, but has shown up three years in a row, despite terrible compacted soil, with low nutrients, and not being given any fertilizer or water.

The fruit flavor is shockingly sweet. It is the sweetest tomato I have ever tasted. Definitely sweeter than Sun Gold.

The plant appears to have early blight on some of the leaves, but it otherwise healthy.
The vines are about 5 feet long, and it appears to be an indeterminate. It is regular leafed.
The trusses have 12 tomatoes on each, although some of them fork which seems unusual.

The fruit is a red mid-sized cherry, with two seed chambers. Many of the fruit have the leaves at the top bunched together or fused instead of being 5 evenly spaced sepals.

The pattern of the size of leaves along a branch is chaotic and inconsistent from one branch to the next. The leaves themselves are small and have fairly smooth edges.

Attached are photos of the soil it is growing in. A wide shot of the plant sprawling over concrete, closeups of the leaves, and the fruit.