R5's note said FR-DSP-2 "was rewritten rather than implemented". It was
not: the clause still demanded viewport tiling, the matrix listed it
unbuilt, and frame-budget.md's rewrite had been proposed and never
applied. Decided 2026-09-19 to keep it as written until S6 runs on a
mid-range Android device, because the measurement that argues against
tiling was taken on a discrete desktop GPU and the clause exists for the
device whose memory the image exceeds. Both notes now say that.