📘 CONTAINER ENGINE GOLD — PHASE 2

3rd Millennium Chess™ — Authoritative Rules Engine (Atomic • Seam-Safe • Attack-Correct)
Version: Phase 2A | Status: Canonical-Intented (requires your final lock)
Build: Atomic transactions + bounded wrap-sliding + attack-based check + promotion + halfmove fix

📋 PHASE 2 API SURFACE

engine.create(config) → Engine instance
engine.validateCanonical() → {ok, errorCode?}
engine.getHandshakeDigest() → {ok, hashHex, errorCode?}
engine.acceptPlayboardHandshake(hashHex) → {ok, handshake, errorCode?}
engine.getHandshakeState() → {ok, handshake}
engine.resetGame() → void
engine.initStartingPosition() → {ok, revision, events, errorCode?}
engine.verifyStartingPosition() → {ok, counts, errorCode?}
engine.getSnapshot() → GameSnapshot
engine.getContainer(index) → ContainerRecord
engine.getLegalMovesFrom(fromIndex) → {ok, moves, requiresIntent, errorCode?}
engine.requiresIntent(fromIndex) → {ok, requiresIntent}
engine.tryMove(moveRequest) → MoveResult
engine.getGameStatus() → {ok, status, detail?}