Design draft for the hub, catalogs and community products

Co-Authored-By: Claude Opus 5.5 <[email protected]>

README.md

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+# t5de-hub
+
+T5DE's hub: accounts linked to IMVU accounts, the registry of community products and catalogs, presence, T5DE-hosted
+rooms, and the website with the moderation console. Part of T5DE (git.t5de.dev/t5de).
+
+Design: [docs/design.md](docs/design.md) (draft). No code yet.