swipelab 98752fe8ec P3.1: base match scoring by run length (pure sx) ...

Add a run-enumeration path and base scoring to the pure-sx model, scoring
one resolution round's clears purely by maximal-run length.

- find_runs(board) enumerates each maximal H/V run (len >= 3) with its
  length, parallel to find_matches/MatchMask (left untouched so every
  clear/cascade caller is unaffected).
- run_score(len): length 3 -> 30, 4 -> 60, 5+ -> 100 (named constants).
- score_round(board): sum of run_score over the current runs (read-only,
  must be called before the round's clear). L/T rule: each maximal run
  scores independently by its own length, so an overlapping L/T scores
  horizontal + vertical (shared corner counts toward both runs).
- Board gains a running `score` field (init zeroes it) and add_round_score
  accumulates a round's base points into it; the cross-round combo
  multiplier off Cascade.depth is left for P3.2.
- tests/score.sx golden over hand-crafted single-round boards asserts exact
  points for len-3/4/5 runs, disjoint runs (sum), an overlapping L/T, and a
  no-match board (0).

2026-06-04 21:01:01 +03:00

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