spine-fanout

Apply the two new-work defaults — ship the minimal WORKING end-to-end spine first (or file the spine as its own issue), then fan out the 3..50+ follow-on QA/dogfood/productization backlog at creation time via fak issue fanout. Use when starting any new feature/leaf/verb/demo, when a spine just shipped, when asked to "fan out", "file follow-ons", "create the e2e spin", or at the end of a super-loop turn that landed…