if it was just a rogue seedling in MA... dug up for some local plant auction ... i would suspect that it is the free seeding Cercis canandensis ... see link for its potential.. if it is in fact.. that plant .. it usually blooms leafless ... so try to find pix of a leafed out tree .. for shade potential ...

they are understory trees ... and do just fine in full bright shade... but grow with less vigor.. the darker it gets .. it wont get as big ...

https://duckduckgo.com/?q=Cercis+canandensis&t=ffcm&iax=images&ia=images

a very old one came with this house ... it was probably 20 x 20 feet ...

without pix of your garden ... i cant personally comment on shade potentials ...

ken

We have a redbud and a Japanese
Maple, and the redbud is nowhere near as dense as the maple. I would not call it a shade tree at all. It’s more airy, along the lines of a dogwood perhaps (in terms of density). Hope that helps.

So this is the garden, pardon the weeds ... we're fighting the dreaded creeping bell flower, so getting through it is slow.

From west to east:

The large hickories by the wall are very, very tall; ours is about 40', and the neighbor's is about 50' tall. It gets morning sun, though, and then afternoon sun once the sun gets past the cedar (shown in later picture). I know it's not the best contrast ... we're kind-of between its best seasons, but we're not adding new plants to any area that we have not eradicated the bellflowers from.

From the south east:

The shrubbery next to the vehicles is the lilac to the west that I mentioned (with a red maple behind it); the hedge in the front is the other lilacs, extending all the way to the wall shown in the first picture, except where a large oak creates too much shade (what I'm trying to avoid for the rest of the hedge). That's also a small lilac on the very left edge of the picture in the garden.

And then this is the shade garden to the south of the sun garden:

With the Japanese maple I mentioned. (Yes, the two did used to be one huge garden ... we moved all the real plants and weed-whacked the masses of weeds and blackberry canes that inhabited that middle swath.)

The serviceberry I'm comparing to:

(the bamboo behind the wall is absolutely not ours, and we do have a root barrier to keep it that way)

The other thought had been back at the edge of the woods:

There are dogwoods and blueberry bushes planted to the north of this along the same edge ... as the sticks might imply, there was a tree a little ways in (on the right) that is to be replaced due to bad stock from the provider (was a single stemmed serviceberry). The space on the left was our thought for a red bud ... before we bought one quite so tiny.

Regardless of location, we'll probably put a wire cage around it to protect it from bunnies and somewhat from deer.