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Does anyone know what Pulumi does to get the json schema for terraform providers (that it uses for code-gen purposes) ?

You're referring to bridged Pulumi providers, which take Terraform providers as an internal dependency.  The code that generates the Pulumi schema from the Terraform schema is in the `tfgen` package of `pulumi-terraform-bridge`: <https://github.com/pulumi/pulumi-terraform-bridge/tree/master/pkg/tfgen>

In any bridged provider, there's a `make tfgen` target that generates `schema.json`: <https://github.com/pulumi/pulumi-artifactory/blob/main/Makefile#L22-L25>

`tfgen` iterates the TF schema and docs and uses them to generate the equivalent Pulumi schema.

so, where does the _terraform_ schema come from?

I was looking at the terraform aws provider, and I couldn't find where that might be in the repo

It's all over the place. The schema in TF is defined in Go code.

ya, I'm trying to figure out if there's a programmatic way to get it _out_ of a resource

and the best I can tell is this:
<https://developer.hashicorp.com/terraform/cli/commands/providers/schema>