Add ROADMAP.md from the 2026-09-10 review !5

merged merged by cmc on 2026-09-11 02:12 UTC · krz/skunky-art:docs/roadmap into main

Discussion

cmc

Roadmap from the full review: upstream cost table, five tiers of issue-sized items with fix, files and verification, and the stacked MR order. Issues #7 through #34 were created from it and are referenced in the headings.