feat: add shim package re-exporting the provider constructor

The provider implementation lives in internal/provider, which Go's module
visibility rules make unimportable from outside this repository. Re-exporting
New through a non-internal shim package lets external tooling embed the provider
— in particular a Pulumi provider built on the Pulumi Terraform Bridge, which
must construct the terraform-plugin-framework provider to generate a schema and
language SDKs.

No behavior change: shim.New returns exactly what main.go already passes to
providerserver.Serve.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>

Author: hagaym1

shim/shim.go

@@ -0,0 +1,20 @@
+// Package shim exposes the provider constructor to external Go modules.
+//
+// The provider implementation lives in internal/provider, which Go's module
+// visibility rules make unimportable from outside this repository. Re-exporting
+// New here lets external tooling embed the provider directly — in particular a
+// Pulumi provider built on the Pulumi Terraform Bridge, which must construct the
+// terraform-plugin-framework provider to generate its schema and language SDKs.
+package shim
+
+import (
+	"github.com/hashicorp/terraform-plugin-framework/provider"
+
+	internalprovider "github.com/cognitionai/terraform-provider-devin/internal/provider"
+)
+
+// New returns the Devin provider constructor, identical to the one used by the
+// provider's own main entrypoint.
+func New(version string) func() provider.Provider {
+	return internalprovider.New(version)
+}