port map: scaffolding, snow shade and the sulfur trigger are ported

game2-015.tsv said the scaffolding block has no tick arm, that snow layers
have no shade brightness lookup, and that geysers never erupt. All three are
in the tree.

tools/port_map/game2-015.tsv

@@ -9,7 +9,7 @@ PointedDripstoneBlock.getDripParticle	port	crates/horizon-client/src/game/level_
 PotentSulfurBlock.isSourceIfFluid	inline	crates/horizon-world/src/level/shapes.rs::Sim::potent_sulfur_state	source_if_fluid check inside the state rule
 PotentSulfurBlock.onPlace	port	crates/horizon-world/src/level/shapes.rs::Sim::potent_sulfur_on_place	ticked in #3516; `PotentSulfurBlock.onPlace` is cited at crates/horizon-world/src/level/shapes.rs:878
 PotentSulfurBlock.spawnBubbleParticlesAt	inline	crates/horizon-client/src/animate_tick.rs::block_animate_tick	two sulfur bubbles in the potent sulfur arm; add_visible is the always-visible add
-PotentSulfurBlock.triggerEvent	missing		minor: only stores the eruption tick that the geyser plume timing reads; geysers never erupt in Horizon (see getTicker)
+PotentSulfurBlock.triggerEvent	port	crates/horizon-world/src/level/pistons.rs::Sim::trigger_event	the potent sulfur arm answers handled, and the caller hands the block entity the eruption's game time, which the plume timing reads (the geyser itself erupts in game/potent_sulfur.rs)
 PotentSulfurBlock.getTicker	port	crates/horizon-client/src/game/potent_sulfur.rs::Game::tick_potent_sulfur	ticked in #3516; `PotentSulfurBlock.getTicker` is cited at crates/horizon-client/src/game/potent_sulfur.rs:133
 PowderSnowBlock.skipRendering	port	crates/horizon-world/src/block_render.rs::FaceVisibility::skips	same_block skip kind from the block data
 PowderSnowBlock.fallOn	port	crates/horizon-world/src/block_landing.rs::BlockLandingRegistry::fall_on	powder snow landing sound from 4 blocks, small or big by 7
@@ -27,7 +27,7 @@ RailState.connectTo	port	crates/horizon-world/src/level/rails.rs::Sim::rail_conn
 ScaffoldingBlock.createBlockStateDefinition	skip:data		block state definition is data (blocks table in horizon-items)
 ScaffoldingBlock.getStateForPlacement	port	crates/horizon-world/src/level/place.rs::Sim::placement_class	distance, bottom and waterlogged for the Scaffolding arm
 ScaffoldingBlock.updateShape	port	crates/horizon-world/src/level/shapes.rs::Sim::update_shape_class	waterlogged water tick and the one-tick schedule
-ScaffoldingBlock.tick	missing		unsure: Sim::tick_block has no Scaffolding arm, so the distance and bottom are not recomputed each tick and the fall or break at distance 7 may be missing (player would see scaffolding fall or break when its support goes)
+ScaffoldingBlock.tick	port	crates/horizon-world/src/level/tick.rs::Sim::scaffolding_tick	distance and bottom recomputed each tick; a stack that reaches 7 falls, or drops when it was already 7, otherwise the state is set with an update
 ScaffoldingBlock.getCollisionShape	port	crates/horizon-world/src/block_collision.rs::ScaffoldingCollision::shape	
 ScaffoldingBlock.getFluidState	port	crates/horizon-world/src/registry_fluid.rs::RegistryFluidWorld::fluid_state	waterlogged state from block data
 RedStoneOreBlock.interact	port	crates/horizon-world/src/level/interact.rs::Behaviours::attack_block	gap: player: no red dust burst when the ore lights; the lit set is in attack_block and game/sculk.rs step_on_redstone_ore
@@ -134,7 +134,7 @@ SignBlock.otherPlayerIsEditingSign	missing		unsure: minor: no check that another
 SignBlock.setPlacedBy	port	crates/horizon-client/src/game.rs::Game::use_hand	gap: minor: the sign editor opens after a sign is placed; no allowed-editor player is stored
 SnifferEggBlock.onPlace	port	crates/horizon-world/src/level/hooks.rs::Sim::on_place	sniffer egg arm: moss boost, place event and the hatch timer
 SnowLayerBlock.isPathfindable	skip:data		path types come from the per-state path data (mobs/path.rs)
-SnowLayerBlock.getShadeBrightness	missing		unsure: minor: no shade brightness lookup for snow layers found; vanilla returns 0.2 for a full eight layer block
+SnowLayerBlock.getShadeBrightness	inline	crates/horizon-client-render/src/mesher.rs::MeshTables::new	a full eight-layer snow block shades 0.2 like a full cube, fewer layers 1.0, in the shade table
 SnowLayerBlock.updateShape	port	crates/horizon-world/src/level/shapes.rs::Sim::update_shape_class	snow layer arm: air when it cannot survive
 SnowLayerBlock.randomTick	port	crates/horizon-world/src/level/tick.rs::Sim::random_tick_block	
 SnowLayerBlock.canBeReplaced	port	crates/horizon-world/src/level/place.rs::Sim::can_be_replaced