Extract images from PodSpec using Cue (& Central Registry)

[MPV]

• Extract images from PodSpec using Cue #28

But also with:

• Only use CUE Central Registry (no local schema fallback)

[MPV]

Superseded by #83, which adopts CUE on current master.

This one sourced schemas from the CUE Central Registry only, with no local fallback. #83 deliberately goes the other way: cue get go k8s.io/api/core/v1 (make schema) generates the definitions from the vendored module and checks them in.

Same official types, arrived at differently — worth stating the trade since this PR is the reason it was a choice at all:

• No network dependency at build or run time, and nothing to fetch in CI or in the release build.
• The schema version is pinned to the k8s.io/api already in go.mod, so a Renovate bump moves both together rather than leaving them to drift apart.
• The cost is 45 generated .cue files (~712 KB) checked in, and a make schema step to re-run on a k8s.io/api bump — which the registry approach would not need.

Closing as superseded rather than rejected — the cue-with-cursor-central-registry branch is untouched, and if the checked-in generated tree turns out to be the objection to #83, this is the alternative to revive. #83 is one of four candidates for #26 (#81 #82 #83 #84).

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