swipelab 3e180a121a P2.4: cascade resolution loop (pure sx) ...

Add the settle loop a swap triggers: resolve(board) runs rounds of
detect -> clear -> collapse -> refill until a round finds no match,
returning a Cascade { depth, cleared } so P3 can read per-round
cleared-cell counts and the combo-driving depth. resolve_step exposes
one round. Termination follows from eventually reaching no-match; no
artificial round cap.

tests/cascade.sx: a fixed-seed hand-crafted board where clearing the
initial BBB lets gravity pack col 0 into a fresh vertical RRR, so the
loop chains two rounds; snapshots each per-round board and the final
depth, asserts the final board is stable and that public resolve
reproduces the manual loop, plus a depth-0 control on an unchanged
checkerboard. Locked in tests/expected/cascade.{stdout,exit}.

2026-06-04 20:48:20 +03:00

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