fakerelay: outside rows for Pi and Codex agents #591

User story

As an eve developer, I want fakerelay worlds to hold Pi and Codex outside rows, so that eve's specs can show what a person sees on those rows.

Context: fakerelay's outside rows are Claude only. After relay#586, a Claude row in no project can no longer carry no_project, so no fakerelay world can show eve's "Not in a project, so it can't be adopted." line, which relay still sends for Pi and Codex rows. Found while working #586.

Acceptance criteria

• A fakerelay world can name a row's agent as claude, pi or codex.
• A Pi or Codex row in no project serves adoptable: false with adoptReason: "no_project".
• The validator refuses no_project on a Claude row in no project.

What I'd notice

Nothing.

Tasks

• World field and validation; docs/fakerelay.md.
• Prooftest cases.