Neroland Core

Additive minor — new APIs and content only; no removals. Every existing API signature, tag, id, and capability is unchanged.

Added

Storage blocks (moved in from Nerospace)

• Battery, Fluid Tank, Gas Tank, Item Store, and the Trash Can — passive storage endpoints, plus a Creative variant of the first four (nerolandcore:creative_*). These are Core's first block-entities. New ids: nerolandcore:battery, nerolandcore:fluid_tank, nerolandcore:gas_tank, nerolandcore:item_store, nerolandcore:trash_can.
• The Trash Can is a bottomless void sink: pipe or hopper items, fluid, or gas into it and they are discarded (input-only, no extraction). It opens a vanilla chest-style GUI with a single drop slot that voids on the next insert, and brought Core's first menu type plus the client screen infrastructure (a MenuType registration seam and a per-loader client screen registration hook).
• All are pickaxe / iron-tier mineable, drop themselves, and ship crafting recipes whose ingredients reference the existing #c: material tags (the Trash Can is cactus + iron ingots).
• Behaviour is unchanged from Nerospace except, because Core ships no specific fluids or gases, two generic defaults: the Creative Fluid Tank now starts empty (right-click a filled bucket to set its endless fluid) and the Creative Gas Tank now learns its gas from the first gas piped into it.

Generic fluid & gas storage APIs

• Fluid — NeroFluidStorage (contract) + FluidBuffer (bounded impl) + the cross-mod nerolandcore:fluid capability.
• Gas — NeroGasStorage (contract) + GasBuffer (bounded impl) + NeroGases (helper; gases identified by an Identifier) + the cross-mod nerolandcore:gas capability.
• Both mirror the existing energy seam (NeroEnergyStorage / nerolandcore:energy): downstream mods register their own block-entities against nerolandcore:fluid / nerolandcore:gas exactly as they do against nerolandcore:energy.