feat(cli): resolve providers from the registry the project targets

[jsteinich]

Related issue

Addresses the code-level readings of #208. Stacked on #443 — merge that first; this branch contains its commit and reuses the registry mechanism it adds.

Description

#208's title reads like a dependency-manager change while its body is about sample code on registries, so it admits three readings. This takes the two that are code-level, using the same targetVersions-derived registry as #443 — OpenTofu only when it is the sole declared product, Terraform otherwise.

The through-line: OpenTofu users have been told to fully qualify their providers, because everything here hardcoded registry.terraform.io. These changes make that advice optional rather than required, without breaking anyone already following it.

1. Bare sources expand against the project's registry

normalizeProviderSource hardcoded the Terraform host, so cdktn provider add aws always produced registry.terraform.io/hashicorp/aws. It now expands against the registry the project targets, so an OpenTofu project gets registry.opentofu.org/hashicorp/aws.

A source that already names a host is still left untouched, so an explicit registry.opentofu.org/... always wins — over the project's target, and over the default for a project that declares no targetVersions.

2. Explicitly qualified OpenTofu providers silently skipped version resolution

This is a live bug on main, and it hits exactly the users who followed the fully-qualify advice. Version resolution was gated on:

if (!constraint.version && constraint.isFromTerraformRegistry()) {

where isFromTerraformRegistry() is hostname === "registry.terraform.io". A provider written as registry.opentofu.org/hashicorp/aws with no version failed that check, so no version was resolved and none was written.

It becomes isFromPublicRegistry() — whether the host is a registry cdktn can query at all. Private and self-hosted registries are still correctly excluded, since they expose no versions API.

3. Resolution and the browse URL follow the constraint

Both now derive from the constraint's own hostname rather than a registry threaded down the call chain. That is what makes explicit qualification win, and it let the DependencyManager parameter from the first commit go away again.

Both registries expose the same /v1/providers/{ns}/{name}/versions shape, and their version lists differ — 42 versus 41 for hashicorp/random at time of writing — so an OpenTofu project could previously be told to pin a version its own registry does not carry.

The error text's browse URL follows too: search.opentofu.org/providers for OpenTofu, since registry.opentofu.org/browse/providers is a 404.

simplifiedName drops whichever public host it carries, not just Terraform's.

What is still out of scope

The third reading of #208 — publishing CDK Terrain samples to the OpenTofu registry — is untouched, so the issue stays open for it.

cdktf-config-manager still strips only the Terraform prefix when writing cdktf.json, which means an OpenTofu project's providers are written fully qualified. That round-trips correctly and matches what those users already write by hand, so it is left alone deliberately rather than risking a strip that normalization would not re-add.

Testing

registry-api.test.ts covers all four paths with the MockAgent pattern the neighbouring tests use: default resolves against Terraform; a bare source under an OpenTofu target expands and resolves against OpenTofu; an explicitly qualified OpenTofu source resolves even with no declared target; a private registry is not queryable.

nx test @cdktn/cli-core (so the dependency chain is built): all suites pass.

Running jest directly in the package without building siblings reports failures on Cannot find module '@cdktn/hcl2cdk' / '@cdktn/hcl-tools' — pre-existing and unrelated.

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