Treat the ECR registry JWT as a signed identity pointer rather than a
permission grant. Every /v2/* request now rehydrates the token's access
key against current IAM/STS state, maps the OCI route to an ecr: action
and repository ARN, and runs the identity-policy evaluator before
dispatch. PullOnly/ReadOnly principals can no longer push, overwrite
tags, or delete manifests, and key/session/user/role/account/policy
revocation takes effect on the next request instead of at token expiry.
Cross-repository blob mounts now require source-read permission and
proof the digest is referenced by a manifest in the named source repo,
closing an account-wide blob-fishing gap.
Josh Siviour
908bfbfc27