feat(artifact): the contract is a digest, and promotion never rebuilds - #16
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cd-workflows sealed how a change is approved and applied but never said what moves. Now it does: a deployable artifact is an OCI image in ghcr named by content digest, built once on the fleet by ci-workflows' docker-build, promoted through environments by re-pointing tags at the same digest -- cd-promote.yml verifies the digest exists before writing the tag and reads the tag back to prove it resolves to exactly those bytes. The module validator holds the promotion surface closed: no checkout, no build-push, no free-form runner, inspect before create. The almaty registry build-offload is the named first consumer; its Stage 1 already pushes ghcr, so its digests exist from birth. Claude-Session: https://claude.ai/code/session_01LsGid6U5RrQdFvJmvYdGCF
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Adds the artifact contract (
docs/artifact-contract.md) and its one moving part,cd-promote.yml: givenimage/digest/to_tag, verify the digest exists in ghcr, point the tag at it withimagetools create, read the tag back and fail unless it resolves to exactly that digest.packages: writeis the entire privilege surface — no checkout, no build context.scripts/validate_module.shgains a promote block holding that surface closed (required: input regexes, inspect-before-create, read-back; forbidden: checkout, build-push,pull_request_target,secrets:, expression runners) — mutation-tested: insertingactions/checkoutfails the validator.Build once on the fleet (ci-workflows
docker-build.yml, registry layer cache), promote by digest, retention cleans untagged manifests. First consumer: the almaty registry build-offload, whose Stage 1 already pushes ghcr.Closes the estate ledger item
cd-artifacts-promote-by-digest-through-ghcr.https://claude.ai/code/session_01LsGid6U5RrQdFvJmvYdGCF