Naming of attributes of Agents

## Is your feature request related to a problem? Please describe
I find the naming of two attributes/columns in the agent.csv file— **"Name"** and **"AgentShare"**— are not intuitive, (perhaps other users might feel the same??)

According to the documentation ((https://muse-os.readthedocs.io/en/latest/inputs/agents.html), the definitions of these two attributes are:
"Name": Refers to the name **shared** by a retrofit and new-capacity agent pair.
"AgentShare": Refers to the share of the existing capacity assigned to this agent.

To me, a "Name" column normally is some kind of identifier of an agent, but here in MUSE,the value in the "Name" attribute/column is something (name) that agents **share**.

## Describe the solution you'd like

I don't have a solution, but I am thinking the **"Name"** attribute may be called something like "SharedName"??
And my understanding of the "AgentShare" attribut is it's some kind of ID of an agent, so maybe something like "agentID"???
(In addition, if "retrofit-new" pair will no longer be used in future version of MUSE, maybe the "Name" column can be even dropped?)

まず agent.csv のスキーマと issue にリンクされている Agents の入力ドキュメントを確認し、その後、Name と AgentShare がどこで使用されているかを追跡します。意図されたセマンティクスと、名前を変更した場合の影響を明確にします。名前に関する決定と、影響を受けるドキュメントまたは入力について合意し、更新されれば完了です。

索引モデルが issue の本文から書いたものです。