refactor agent pre-step inbox lifecycle

examples/headless-agent/tests/fixtures/goal-domain/seed-goal.ts

@@ -7,11 +7,13 @@ export const name = 'seed-goal'
 export const inject = ['goals']
 
 export function apply(ctx: Context): void {
-  ctx.on('agent/step', (agent) => {
-    if (ctx.goals.get(agent) !== undefined) return
-    ctx.goals.create(agent, {
-      objective: 'Prove the composed goal survives in the session log',
-      maxGoalRounds: 7,
-    })
+  ctx.on('agent/pre-step', (agent, _messages, _context, next) => {
+    if (ctx.goals.get(agent) === undefined) {
+      ctx.goals.create(agent, {
+        objective: 'Prove the composed goal survives in the session log',
+        maxGoalRounds: 7,
+      })
+    }
+    return next()
   })
 }