sandbox image sdk

[kcoopermiller]

Note

Medium Risk
Introduces new build/upload logic and changes request/response models and CLI parameters around image building; incorrect mapping or tarball filtering could break image builds or sandbox creation payloads.

Overview
Adds a new ImageClient/AsyncImageClient to the prime-sandboxes SDK for building, polling, listing, and deleting registry images via the /images API, including optional build-context upload as a .tar.gz that honors .dockerignore.

Extends SDK models with Image* types plus sandbox fields (imageBuildId/imageBuildStatus) and relaxes CreateSandboxRequest to allow either a prebuilt docker_image or a dockerfile-based build. The prime images push command now filters the context using .dockerignore and drops the previously-sent platform parameter, and both the SDK and CLI add pathspec as a dependency.

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