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Every bundle the CMS writes — upload, clone, sync, repair and the pet / effect / figure importers — now lands as `<classname>.hab`, the extension this deployment's renderer asks for. `.hab` and `.nitro` are the same container, so an upload of either extension is accepted. Resolution goes through one module, src/lib/furni/bundle-file.ts, so nothing has to know the extension twice. Every existence check probes `.hab` first and falls back to `.nitro`: the on-disk asset set is still predominantly `.nitro`, and without the fallback Studio would report every imported item as missing and the cleanup scan would classify 18k live bundles as fake leftovers. Downloads are unchanged — Habbo's CDN and every configured clone source still serve `.nitro`, so the conversion happens on write, not on request. Deliberately unchanged: the staged-attachment store in furni-attachment.ts keys on a UUID and never reaches the client, so renaming it would break in-flight recovery jobs. Adds scripts/migrate-nitro-to-hab.ts to rename the existing asset set. It refuses to run without --dry-run or --yes, never overwrites an existing .hab, never deletes, and is idempotent. Note: renderer-config.json lives outside this repo and was patched to .hab separately; that file is served with a 30-day max-age, so returning clients need a cms-client cache purge to pick the change up.