- AGENTS.MD: save menu section rewritten (grid screens, factorised slot
ops, thumbnail pipeline), grid_layout in the tree, five new pitfalls
(no numeric text interpolation, no string concatenation, getscreenshot
reduces, btn zones without btndef, rmenu guards windowerase).
- TODO.md: C30 proof updated to the grid journey, new C31 done (factorised
waits + right click while reading), detailed decisions recorded.