Looped *video* footage had a regression (#1045); a grouped PNG sequence
going through the same path — interpret a fresh placeholder to Loop 15,
drag it onto the timeline — did not. The behaviour is already correct on
main (addItem sizes a sequence layer from looped_duration, the pool's
frame_index wraps per cycle), so this is coverage, not a change:
interpret_footage_loop_extends_sequence_layers asserts a 15-loop of a
0.4 s sequence lands a 6 s layer.
cargo test -p effectcraft-engine --lib interpret_footage: 4 passed.
Vikram Bhaskaran
f12d75e37a