Emerald Matrix

Every surface is authored at the *exact* native pixel geometry of the vanilla
26.3 client, so the pack scales cleanly at every GUI scale setting with zero
layout drift. No `.mcmeta` sidecars are required – all nine-slice and animation
rules fall back to the vanilla defaults.

## What it changes

| Area | Result |
| — | — |
| Container screens | Pitch-black data-terminal panels with recessed slots, emerald phosphor dividers, CRT scanlines and L-shaped corner brackets. Covers the survival inventory, chests (`generic_54`), crafting table, furnace / smoker / blast furnace, enchanting table, anvil, smithing, brewing stand, hopper, dispenser, shulker box, loom, cartography table, stonecutter, crafter, beacon, horse, villager and creative item tabs |
| HUD | Cascading digital readouts replace the traditional icons: health is a row of emerald column meters, hunger uses amber quadrants, armour uses mint segment rows, and oxygen is a dot-matrix gauge. Matching XP, jump and locator bars, hotbar and off-hand frames |
| Crosshair | Precision corner-bracket 
reticle with a centre dot, plus a matching attack-cooldown ring and hotbar bar |
| Menus & widgets | Dark-mode buttons, sliders, text fields, checkboxes, tabs, scrollbars, tooltips, popups, ping icons, notification dots and the title / pause menu backgrounds |
| Typography | A slimmer, higher-contrast re-authored 5×7 bitmap font with a reinforced baseline for dense item names, chat and developer tools |
| Status effects | Recoloured terminal effect tiles and phosphor glyphs || Pack icon | `pack.png`: an emerald digital-rain plate with a reticle and terminal prompt |