Make pending asset bookkeeping linear

docs/roadmap/remediation.md

@@ -263,7 +263,14 @@ validation behavior across the two supported CI paths.
 
 ## 6. Make pending-asset bookkeeping linear — P3
 
-Status: open.
+Status: complete.
+
+**Completed:** Replaced repeated slice removals with pending-map updates and a
+single deferred compaction pass on every return path. Category bookkeeping is
+now expected O(`n`) with O(`n`) metadata, preserving pending observation order.
+Added an early-return regression with out-of-order observations for definitive
+and uncertain failures. Delivery/Gitea tests and focused facade/CLI recovery
+tests passed.
 
 **Evidence:** `uploadMissingAssets`, `reconcileAssetUpload`, and
 `removeIdentity` in [shared asset delivery](../../internal/delivery/remote_assets.go).