feat: port the image machinery from ecr

ecrou's workspace starts from ecr's confinement-neutral half: image
reference resolution, the content cache with digest freshness, layer
extraction with whiteouts and deferred directory modes, provisioned
hot cells, and the progress/error/config plumbing. Adaptations: the
cache lives in ~/.cache/ecrou, the namespace-era error variants and
utils constants are gone, KvmUnavailable arrives ahead of its caller,
rootfs loses its exec() delegation, and uname(2) goes through libc
now that nix is no longer a dependency. The CLI crate is a stub until
its commit.
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Valentin Haudiquet committed 2026-10-27 22:27:24 +01:00
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