feat(thressgame-coverage): Wave 12 (8 move-gen attr readers)

All 8 movement-replacement / restriction attrs now consumed by move generators in packages/chess/src/rules/. Previously they were silent infrastructure (seeded by primitives, ignored by rules).

- T74 MovesAs / MovesAlsoAs (per-piece): turn.ts dispatcher substitutes/unions piece-type movesets via getLegalMovesAsType helper; deduped output
- T75 SlideMustBeMaxDistance (per-piece + game-level): sliding.ts ice-physics mode emits ONLY the furthest legal step per ray
- T75 KingExtraReach (per-piece): king.ts step-walker with configurable radius (1+N); blocked by allies/captures within radius
- T76 BlockAllExceptKing + BlockedPieceTypes (game-level): turn.ts early-return filters BEFORE per-piece dispatch
- T77 MoveClassRestriction (game-level): post-filter in turn.ts; class=capture/advance/move-to filtering
- T77 PawnPushesPiecesEnabled (game-level): pawn.ts diagonal capture replaced by push semantics; LegalMove extended with isPawnPush + pushedPieceId + pushedTo

Tests: 2774 -> 2824 (+50). bun run check exit 0.

ice_physics, all_on_red, mr_freeze, must-class, block-by-piece-type, pawn-pushes-pieces descriptors now actually affect legal-move generation in production play.

.sisyphus/boulder.json

@@ -83,7 +83,11 @@
     "ses_23488f9dcffeFtCzBn3gxtN7KV",
     "ses_23487dd88ffeEDMNwvBDLByD9N",
     "ses_23488a4a2ffeG7nzsoF7nsvKHC",
-    "ses_234882ba1ffeMwDf2VAt2fGKaM"
+    "ses_234882ba1ffeMwDf2VAt2fGKaM",
+    "ses_23470e618ffeKuOqxTyN3WMJmm",
+    "ses_23470aeb5ffen8G71F1kKLXWE4",
+    "ses_234704ca2ffexGa7YYzkVJ7XQy",
+    "ses_234714154ffePk1XQUSvX1tcat"
   ],
   "plan_name": "thressgame-coverage",
   "agent": "atlas"