Adds instance_role + reserved email/mfa_secret columns to admin_users,
creates app_members for per-app role grants, and creates api_keys for
bearer-token credentials. Schema snapshot re-blessed.
Reserves invites and service_accounts shapes in a trailing comment
block — both land in their own migrations when those flows ship.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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