Give each agent thread its own running instance of the app

One bullet under the general rules: start one instance per thread, keyed
by worktree or branch, with its own Hive store inside the app container;
hot reload it with SIGUSR1 after each edit; keep it for the thread's life;
never sign out from it.

Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>
a3e1c38996Dara Adedeji committed on 9/13/2026, 2:09:24 PMparentf36e02b

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