docs: remove the last private MEMORY references from design docs

Three `MEMORY → <note>` see-also references pointed at the private agent-memory
system from public docs (demo-deployment-design.md x2, registry-manifest-design.md
x1). Removed. No tracked doc references the memory system now.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>

docs/archive/demo-deployment-design.md

@@ -7,8 +7,7 @@ secrets/backend. Deployed via **Portainer**, mock-data driven, with working file
 storage and a testnet-flavored Bitcoin sandbox so visitors can play freely.
 
 See also: `neode-ui/mock-backend.js` (existing mock), `docker-compose.demo.yml`
-(existing demo stack), `MEMORY → reference_neode_ui_dev_testing`,
-`MEMORY → reference_ovh_168_mirror` (Portainer/registry host).
+(existing demo stack).
 
 ---
 

docs/registry-manifest-design.md

@@ -9,7 +9,7 @@ signed app-catalog on the registry — **no OS-level code reliance, no
 OTA-shipped disk manifest required**. Rootless, signed, robust, reboot-survivable.
 
 See also: [`docs/dht-distribution-design.md`](dht-distribution-design.md) (this is
-its "discovery/authenticity" layer), `MEMORY → project_manifest_driven_north_star`.
+its "discovery/authenticity" layer).
 
 ---