Retry #3719 and fix broken link (#3723)

* Fix url and remove unavailable service

* Add inline depedencies to `tools/check_links.py`

fast/stages/0-org-setup/README-GCD.md

@@ -132,12 +132,12 @@ provider "google-beta" {
 
 ### Defaults Configuration (`defaults.yaml`)
 
-Update your `defaults.yaml` file to include a `universe` block within the `overrides` section. This configures the correct API domains and disables service identities that are not available in GCD. 
+Update your `defaults.yaml` file to include a `universe` block within the `overrides` section. This configures the correct API domains and disables service identities that are not available in GCD.
 
 Additionally, you must provide valid values for the following fields in the context section:
-* `context.email_addresses.gcp-organization-admins`: used to set the [essential contact]([url](https://docs.cloud.google.com/resource-manager/docs/manage-essential-contacts)) for the core projects
+* `context.email_addresses.gcp-organization-admins`: used to set the [essential contact](https://docs.cloud.google.com/resource-manager/docs/manage-essential-contacts) for the core projects
 * `context.iam_principals.gcp-organization-admins`: Used to grant administrative permissions to the administrators.
-  
+
   **Note on Principals:** If you use a group for the admin principal, ensure your user identity is a member of that group. Otherwise, set this field to your own user identity (e.g., `principal://iam.googleapis.com/locations/global/workforcePools/...`) instead of a group. For further details, refer to the [Configure defaults](./README.md#configure-defaults) section in the standard README.
 
 Your `defaults.yaml should` contain sections that look like this:
@@ -277,4 +277,3 @@ Once the **Organization Setup** stage is fully deployed:
     ```
 
 2.  **Proceed to Next Stages:** Continue with the subsequent FAST stages (VPC-SC, Security, Networking, Project Factory). The universe configuration established here is automatically propagated to these stages via the FAST cross-stage output mechanism.
-

fast/stages/0-org-setup/datasets/classic-gcd/projects/core/billing-0.yaml

@@ -1,4 +1,4 @@
-# Copyright 2025 Google LLC
+# Copyright 2026 Google LLC
 #
 # Licensed under the Apache License, Version 2.0 (the "License");
 # you may not use this file except in compliance with the License.
@@ -22,7 +22,7 @@ iam_by_principals:
     - roles/owner
 services:
   - bigquery.googleapis.com
-  - bigquerydatatransfer.googleapis.com
+  # - bigquerydatatransfer.googleapis.com
   - storage.googleapis.com
 datasets:
   billing_export:

tools/check_links.py

@@ -1,6 +1,6 @@
 #!/usr/bin/env python3
 
-# Copyright 2023 Google LLC
+# Copyright 2026 Google LLC
 #
 # Licensed under the Apache License, Version 2.0 (the "License");
 # you may not use this file except in compliance with the License.
@@ -13,6 +13,15 @@
 # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 # See the License for the specific language governing permissions and
 # limitations under the License.
+#
+# /// script
+# requires-python = ">=3.11"
+# dependencies = [
+#    "click",
+#    "marko",
+#    "requests",
+# ]
+# ///
 '''Recursively check link destination validity in Markdown files.
 
 This tool recursively checks that local links in Markdown files point to valid