Run script/setup in new worktrees and give each task a port block

internal/agents/guidance.go

@@ -8,6 +8,7 @@ import (
 
 	"g.fc.run/misc/byre/internal/api"
 	"g.fc.run/misc/byre/internal/claude"
+	"g.fc.run/misc/byre/internal/store"
 	"g.fc.run/misc/byre/internal/todo"
 )
 
@@ -60,7 +61,8 @@ func (m *Manager) bounceProseQuestion(l *live) claude.HookFunc {
 }
 
 func (m *Manager) taskGuidance(ctx context.Context, task api.Task) (string, error) {
-	g := guidance
+	g := guidance + fmt.Sprintf("\n- This task's ports are %d to %d; $PORT holds the first. Run dev servers and anything else that listens on these, so parallel tasks don't collide.",
+		task.PortBase, task.PortBase+store.PortBlock-1)
 	if task.TodoItem != nil {
 		g += fmt.Sprintf("\n- This task was started from the item %q in %s at the repo root. When the work is done, remove that item from %s in this worktree, so the removal lands in the same merge as the work.",
 			*task.TodoItem, todo.File, todo.File)