Grant wafv2 to github-cfn-execution-role for WAF associations (audit M-17) (#33)

Adds read + (dis)associate wafv2 actions so SAM/CFN deploys can attach the shared
seahaven-app-waf CloudFront WebACL to app distributions (meal-order orders).
Without it, the WebACL association fails 'Unable to verify read permissions on
Web ACL'. IAM cross-reviewed (no BLOCK). Not wafv2:* — scoped to read +
associate. Same manual-changeset deploy path as the H-16 change.

oidc-deploy-roles.yaml

@@ -76,6 +76,18 @@ Resources:
                   - cloudfront:*
                   - ssm:*
                 Resource: "*"
+              # WAF (audit M-17) — needed for SAM/CFN-managed WebACL associations
+              # on CloudFront distributions (meal-order-manager orders). Read +
+              # (dis)associate only, not wafv2:*. Added 2026-06-02.
+              - Effect: Allow
+                Action:
+                  - wafv2:GetWebACL
+                  - wafv2:GetWebACLForResource
+                  - wafv2:ListWebACLs
+                  - wafv2:AssociateWebACL
+                  - wafv2:DisassociateWebACL
+                  - wafv2:ListResourcesForWebACL
+                Resource: "*"
 
   # ---------------------------------------------------------------------------
   # SAM deploy roles (4 repos)