f0a79926267a624b2b7aa4859eba185dbd5b9033
`door_defaults` plus `north_door` and `south_door`, each containing a `<<:` key whose value is the defaults dict. north overrides locked, south overrides material. serde_yaml treats `<<` as a literal mapping key, so the target and a player's `<<: *defaults` form parse to the same Value. Default material/locked and which side overrides which are randomised per seed (ChaCha8Rng XOR'd with 0x..09). Not wired into levels::registry() yet — integration belongs to a follow-up. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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