docs: add go-vcr migration guide

Author: jar-b

docs/ai-agent-guides/go-vcr-migration.md

@@ -0,0 +1,15 @@
+# Adding `go-vcr` Support
+
+You are working on the [Terraform AWS Provider](https://github.com/hashicorp/terraform-provider-aws), specifically focused on enabling support for `go-vcr`.
+
+Follow the steps below to enable support for a single service.
+
+- The working branch name should begin with `f-go-vcr-` and be suffixed with the name of the service being updated, e.g. `f-go-vcr-s3`. If the current branch does not match this convention, create one. Ensure the branch is rebased with the `main` branch.
+- Follow the steps on [this page](../go-vcr.md) to enable `go-vcr` for the target service.
+- Once all acceptace tests are passing, commit the changes with a message like "service-name: enable `go-vcr` support", replacing `service-name` with the target service. Be sure to include the COMPLETE output from acceptance testing in the commit body, wrapped in a `console` code block. e.g.
+
+```console
+% make testacc PKG=polly VCR_MODE=REPLAY_ONLY VCR_PATH=/tmp/polly-vcr-testdata/
+
+<-- full results here -->
+```