Drop the ':' before captures (for xs (x) / for 0..n (i)); the index
capture becomes the trailing open range (for xs, 0.. (x, i)). 136
headers across 26 files, mechanical.
Five headless tests (banner_layout, hit_test, swipe_commit,
swipe_intent, swipe_reshuffle) also gain a direct
#import "modules/ui/types.sx" — they named Point/Frame through a
transitive import, which bare visibility no longer permits.
Gates: sx build --target ios-sim main.sx links; tools/run_tests.sh
23/23.
Add swipe.sx: a pure swipe_intent(layout, start, end) -> ?Swap that turns a
touch drag into an optional adjacent-swap intent (A, B). A is the cell under the
drag start (via BoardLayout.point_to_cell); B is its orthogonal neighbour along
the drag's dominant axis (larger of |dx|,|dy|, ties horizontal). Returns null for
sub-threshold drags (a tap, threshold = cell_size * 0.5), starts off the board,
or neighbours off the board. No rendering, no model mutation.
Lock the logic with tests/swipe_intent.sx (+ expected golden), feeding synthetic
down/up positions for right/left/up/down, sub-threshold tap, diagonal→dominant
(both axes), edge-outward off-board, and start-off-board. bash tools/run_tests.sh
passes (13/13); sx build --target ios-sim main.sx compiles.
