subagenttasks

Expand subagentidentities.com's registry as new real identity boundaries are documented

Currently seeded with 5 real rows (macos_desktop_cowork, cloud_docker_mcp, engineering-coworker binary mediation, the shared Cloudflare account, vault/Keychain credential pattern). Add more only when a new REAL boundary is documented somewhere in this repo or the mirrored claude-tag docs — never pad with invented entries. See ctr_identity_registry's done_detail.

closes contract: ctr_identity_registry