atgc migrate existed to finish Tangled's 1.0 move, and every new account is already migrated. The command is now hidden: it is gone from atgc --help, the grouped command list, atgc agent --json and shell completion, and the README, agent docs and agent briefing no longer describe it. It still runs for anyone who invokes it by name.
The user-facing documentation for its JSON shapes and exit codes moved to plan/migration.md. A login that predates the migration scopes now reports each missing scope without naming a command that atgc no longer offers.
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