Google paid $40 million in 2013 for a seven-person startup that had raised $1.4 million total. The two founders behind that startup, Flutter, went on to build Matic, the home robot whose pitch is that you point at a mess, say "clean here," and it goes. Hardware founders tend to guard their process like a trade secret, so it caught my attention when Mehul Nariyawala published the whole playbook this week, years of prototypes laid out as what he calls the Universal Design Process. The part…