codeSplitter: move the Artifacts namespace off codesplitters (copy every repo, rewrite the stored remotes) #823

Split from #809, which moved the D1, queues, bucket, index and app name to codesplitter. The Artifacts namespace stays codesplitters (ARTIFACTS in apps/codesplitter/rustybuns.config.ts) because it can't move the same way:

• It isn't a resource Alchemy replaces. Changing namespace only points the binding at a new, empty namespace, so every repo would vanish at once, and no deploy guard can see it.
• Each repo's git remote names the namespace, and D1 stores those remotes (repos.remote, repos.crew_remote), so moving it means copying every repo and rewriting those rows in the same step.

What moving it would take: list the namespace's repos, git clone --mirror each and push it to the same name under codesplitter, rewrite the stored remotes, then switch the binding in one deploy. Old repos stay until the new ones are checked.

Nothing is broken: the name only shows in the Cloudflare dashboard and in the remotes.

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