ELO    0.00 +- 0.00 (95%)
SPRT   4.0+0.04s Threads=1 Hash=16MB
LLR    0.00 (-2.25, 2.89) [-3.00, 1.00]
GAMES  N: 0 W: 0 L: 0 D: 0
PENTA  [0, 0, 0, 0, 0]

Merge FRC support (#216) Castling is now encoded as the king capturing its own rook, and castling rights store that rook's square for each color and side. Adapted to the current codebase while merging: - Replaced the second 64x64 ray table with RayBetween plus the landing square, and the castle path threat loop with a single mask test - Rewrote the castling rights updates around the captured piece, so a captured rook clears rights without depending on king placement - Dropped the uci::listener lookups from the chess layer in favor of a chess960 flag that the UCI option writes - Standard FENs now resolve the castling rook as the outermost one on its side, and BoardToString emits Shredder FENs in Chess960 - Removed the now unused KingMoves and GetAttackedSquares declarations Co-Authored-By: Quinniboi10 <69563433+Quinniboi10@users.noreply.github.com> Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>