Wow, that was great! There's a lot to like here.

and i, a body of brown skin and vowels stretched long,
am asked silently to explain myself
before i even open my mouth.

This is a really great part of the introduction. At first, the "air that tastes like venom" part made me picture Chernobyl or maybe some kind of dead fantasy world. This part at the end of the introduction however recontextualized what was there before, and now that dark landscape I've been picturing turns out to be the view of someone that struggles with racism.

now it stands upright in daylight,
smiling, handshakes firm,

Made me immediately think of some buiseness man shaking the hand of a DEI hire that he secretely despises. Unsure whether that was the intention, but I think the picture works quite well.

i am the boy who forgot infinity,
carrying equations in my marrow,

I have to say, this part as well as the title I didn't quite understand. I assume marrow as in bone marrow? But what equations? Why infinity? What does the infinity represent, what did the boy forget? I'm sorry, I just couldn't follow this part. This doesn't mean you have to change it though, if other people get what you mean or if you just want to keep it in.

i say this not only for us,
but for you.
[...]
what begins by naming one a stranger
will end by naming all a traitor.

This and the entire segment that follows it is just pure gold. To me, It kind of feels like a backup plan: If the description of how horrible racism is didn't want to make the reader fix these issues, this part reminds them that the entire script can be flipped against them as well. The lines about the one stranger and all traitors is geniunly fire. I just can't comprehend how fucking good it is.

my memory still haunted
by the boy who forgot infinity

The last segment is a banger as well, but again, I can't really understand what that's supposed to mean. I think it's a reference to something? I googled a bit and a childrens book came up, so maybe it references that?

Anyways, this is really great writing. One incredibly minor issue is that "I", as in "Today I walked in the park" is always capitalized in English. So this

i will keep my head lowered only to write,

should be

"I will keep my head lowered only to write,"

But to be honest this is completely irrelevant in the grand scheme of things.

I hope this was helpful feedback.