swipelab 2713a67b2b P2.1: clear matched cells (pure sx) ...

Add the first resolution-pipeline step to the headless board model.

- Introduce an `empty` hole sentinel on the Gem enum (ordinal 6, outside
  GEM_COUNT so the RNG/pick_gem never draw it). board_dump renders holes as
  EMPTY_CHAR ('.') via a single branch in gem_char, leaving boards without
  holes byte-identical to before (existing goldens unchanged).
- clear_cells(board, mask): set every matched cell to `.empty`, leave all
  others untouched, return the count cleared.
- clear_matches(board): detect+clear in one call; returns 0 (board unchanged)
  when there are no matches.

No gravity or refill yet (P2.2 / P2.3).

tests/clear.sx applies detect->clear to hand-crafted boards (single
horizontal/vertical runs, disjoint runs, an overlapping L/T whose shared cell
clears once, and a no-match checkerboard), snapshots before/after, and asserts
matched cells became holes, non-matched cells are unchanged, and the cleared
count is exact. Locked as tests/expected/clear.{stdout,exit}.

2026-06-04 19:57:08 +03:00

947 B

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