data(readiness): extend AWS assessment entrypoints

[auscaster]

Summary

• declare the exact AWS Builder ID and AWS account signup prerequisites for the Activate Founders application
• declare the AWS Activate authorization surface and Billing GetCredits API as operations interfaces
• keep the repository declaration-only; this change asserts no Sourcey findings, grade, or readiness state

Verification

• Catalog-owned changed-closure verifier: 1 vendor, 1 declaration
• DCO sign-off included