Fan-out

One prompt, given to several agents at once, each on a branch and in a worktree of its own, to compare what they make and keep the best.

• New session, on a new branch: pick more agents under “Also give it to”. Each session’s branch is the one named with the agent after it (fix-login-claude, fix-login-codex; an agent picked twice gets -2).
• Command line: enowx-app spawn --agents claude,codex --branch fix-login "Fix the login redirect" prints each session’s ID.

The sessions are grouped (SessionInfo.Group, session.fanOut in the protocol). Compare, opened after starting them and from the command palette on any of them, lists each with its state, note and what it changed. Keep discards the others, with their worktrees and branches, and leaves the one kept to review, commit and merge as any session.