diff --git a/docs/asset-engine/design-brief.md b/docs/archive/asset-engine/design-brief.md
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rename from docs/asset-engine/design-brief.md
rename to docs/archive/asset-engine/design-brief.md
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--- a/docs/asset-engine/design-brief.md
+++ b/docs/archive/asset-engine/design-brief.md
@@ -1,5 +1,15 @@
 # Asset Generation Engine — Design Brief
 
+> **Archived 2026-05-14.** Describes the pre-implementation design intent
+> for asset-engine. Implementation has shipped: source at
+> [`vh/asset-engine`](https://gitea.phasefinal.com/vh/asset-engine),
+> deployed to ana-docker via `stacks/asset-engine/`. The live catalog
+> contract is [`docs/asset-engine/CATALOG-CONTRACT.md`](../../asset-engine/CATALOG-CONTRACT.md);
+> the catalog itself is [`docs/asset-engine/services.yaml`](../../asset-engine/services.yaml).
+> This brief is kept for the design rationale it carries (why Asset is
+> a first-class entity, why v1 is synchronous, what v2/v3 seams exist),
+> not as a guide to current behavior.
+
 For an internal UI that fronts the inference services on `irv-ml1`
 catalogued in [`services.yaml`](services.yaml). Hand this to a design
 agent before any pixels.