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A sibling subdomain can no longer toss a session cookie the hub reads first. Operators are logged out once; plain-HTTP browser login no longer holds a session; Basic auth for scripts is unchanged. Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_0159rPz1ZhFKsS53msqPYxtS