Fix consumed instruction ordering and clear history

go-server/internal/store/instruction.go

@@ -135,9 +135,10 @@ func (s *InstructionStore) Create(content string) (*models.Instruction, error) {
 	id := uuid.New().String()
 	now := time.Now().UTC()
 
-	// Assign next position
+	// Assign next position from the full instruction history so positions remain
+	// globally stable even after the pending queue empties.
 	var maxPos sql.NullInt64
-	_ = s.db.QueryRow(`SELECT MAX(position) FROM instructions WHERE status = 'pending'`).Scan(&maxPos)
+	_ = s.db.QueryRow(`SELECT MAX(position) FROM instructions`).Scan(&maxPos)
 	position := int(maxPos.Int64) + 1
 
 	_, err := s.db.Exec(`