docs: replace asset annotations with OCI ownership referrer (DONT MERGE)#142
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<!-- markdownlint-disable MD041 --> Updates §6.3 of the OCI storage backend spec to trace assets to their owning Component Version via a separate *ownership referrer* manifest (linked through the OCI `subject` field), instead of mutating the artifact with annotations. This matches ADR 0015 and keeps the artifact's digest and any existing OCI signatures intact. - Defines the referrer manifest (artifact type `application/vnd.ocm.software.ownership.v1+json`, empty config/layer, same repository as the artifact) and discovery via the OCI Referrers API with tag-schema fallback. - Rewrites integrity (§6.3.2) and verification (§6.3.3) around the referrer; drops the obsolete `software.ocm.base.digest` annotation and the `ociArtifactDigest/v1` annotation-stripping normalization. - Requires referrers to travel with the artifact across registries and OCI Image Layouts. <!-- Usage: `Fixes #<issue number>`, or `Fixes (paste link of issue)`. --> Fixes: open-component-model/ocm-project#1031 Signed-off-by: Piotr Janik <piotr.janik@sap.com>
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Updates §6.3 of the OCI storage backend spec to trace assets to their owning Component Version via a separate ownership referrer manifest (linked through the OCI
subjectfield), instead of mutating the artifact with annotations. This matches ADR 0015 and keeps the artifact's digest and any existing OCI signatures intact.application/vnd.ocm.software.ownership.v1+json, empty config/layer, same repository as the artifact) and discovery via the OCI Referrers API with tag-schema fallback.software.ocm.base.digestannotation and theociArtifactDigest/v1annotation-stripping normalization.Fixes: open-component-model/ocm-project#1031
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