An organization ADMIN could mint an OWNER membership via createUser, which
only gated iam:membership-profile:create and bypassed the owner-only
iam:membership-role:set-owner check that updateMembership already enforces.
Gate the requested role in both createUser entry points (connect resolver
and the MCP CreateUserTool) with an additional set-owner authorization when
the role is OWNER, mirroring updateMembership. Add a regression test that
locks the ADMIN/OWNER privilege boundary the fix relies on.
Signed-off-by: Sacha Al Himdani <sacha@probo.com>
2ffeb7f3e8