airkjw 0210c14858 Add pure-Dart engine core: RNG, grid, placement, line clear, scoring, piece generator ...

PCG32 seeded RNG; immutable 8x8 GridState with occupancy bitmask;
placement legality + anyPlacementExists; simultaneous row/col clears
with single-count gem credit; combo scoring with one-move grace;
weighted-bag generator with pity bias and depth-3 solvability nudge.
All TDD, 51 tests green.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

2026-06-11 13:05:55 +09:00

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rng_test.dart

Add pure-Dart engine core: RNG, grid, placement, line clear, scoring, piece generator

2026-06-11 13:05:55 +09:00