`attrib.dat`

60×64 — env, neighbours, doors, era gate, roof bits.

Off	Field	Notes
0x00–0x04	id/category/tileset/env/surface	confirmed
0x05–0x08	neighbours N/E/S/W	symmetric overland
0x0E	entry_coord	(Y<<4)\|X spawn
0x0F	era_gate	skip events on mismatch
0x12–0x13	door strength/trap	bash/unlock
0x16/0x18	recall coord/screen	asm
0x20–0x3F	roof_bits	256-bit roof map