docs: replace duplicated SC deployment section with cross-reference

The SC Product Deployment Methods section was near-identical to the
canonical version in lambda-template-repo-generator. Replace with a
concise cross-reference to keep a single source of truth.

.github/copilot-instructions.md

@@ -64,31 +64,11 @@ After editing `buildspec.yml`, run `tf apply` in `lambda-template-repo-generator
 
 ## SC Product Deployment Methods
 
-There are **two ways** to deploy the EKS Terragrunt Repository Creator SC product:
+See `lambda-template-repo-generator/.github/copilot-instructions.md` for full details.
+Both methods use the same CFN product template; they must stay in sync.
 
-### Method 1: Direct Terraform via `lambda-template-repo-generator/deploy/` ✅ Use this for testing/debugging
-
-```bash
-cd lambda-template-repo-generator/deploy
-tf init
-tf apply
-```
-
-Deploys Lambda + CodeBuild project + SC portfolio/product + constraints directly from Terraform state.
-Use as the **reference deployment** to validate changes before touching the census pipeline.
-Current IDs (us-gov-west-1, account 229685449397):
-- Portfolio: `port-h5qd63hw5yagq` (`eks-terragrunt-github-automation`)
-- Product: `prod-lmua4oknugafg` (`eks-terragrunt-eks-repo-creator`)
-
-### Method 2: `terraform-service-catalog-census` Terragrunt (production path)
-
-```bash
-cd terraform-service-catalog-census/non-prod/csvd-dev/west/service-catalog
-tf apply   # (via terragrunt)
-```
-
-Census-managed production deployment. Template source:
-`terraform-service-catalog-census/templates/products/eks-terragrunt-repo/2-0-0.yaml`
+- **Method 1** (testing): `cd lambda-template-repo-generator/deploy && tf apply`
+- **Method 2** (production): `cd terraform-service-catalog-census/non-prod/csvd-dev/west/service-catalog && tf apply`
 
 Always verify Method 1 works first when debugging a census deployment issue.