The trendy new PM title is "product builder." Here's how to actually become one. LinkedIn replaced their APM program with a full-stack builder program. Anthropic calls every PM a "Member of Technical Staff." Rippling's PM job descriptions now require shipping prototypes in the loop. The title is changing everywhere. The skill underneath it is not obvious. Mahesh Yadav has been an AI PM at Amazon, Google, Meta, and Microsoft. He just walked through the entire stack on the podcast: 1. Where…