Update the deployment script with ateom image and wait step.

[wjjclaud]

Summary

• Build and pin the ateom-gvisor worker image from the go.mod pinned substrate module, instead of letting ko apply compile it from the AX module — so AX's go.mod stays tidy. Otherwise, we would need to override the go mod tidy with some indirect dependencies from substrate.
• install-ax.sh --deploy-ax-server now waits for the antigravity ActorTemplate to become Ready (golden snapshot) before returning, with a small progress spinner.
• Bump up substrate version.

Will merge the Antigravity into ax image in a follow up for #120.

Tested

./internal/hack/install-ax.sh --deploy-ax-server

[rakyll]

Why do we need to build this image? Shouldn't we be just using whatever they publish? Only Substrate developers should be building a custom Ateom image.

[rakyll]

Approving this to unblock. We can revisit it later if needed.