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4-tier ladder customer<internal<dev<bcos. Re-tagged Architect/Testing/Claude + platform/technical from internal->dev; Processes stays bcos. Backend visible() enforces a per-instance served-audiences cap at the API. bcos.dev/DLX serve all; production sets GUIDE_SERVED_AUDIENCES=customer,internal so dev/bcos never leave dev. Verified: capped instance returns only Customer+Internal, 404s dev/bcos. Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>