feat(legacy): ornithe port

[saadndm]

General stuff

• Requires legacy-lwjgl3, OSL, and java 25
• Only supports legacy-lwjgl3 SDL3 backend (its the default, no reason to use GLFW)
• Net diff excluding build setup and legacy compat (lines that can merge conflict in future): +1316 -103
• I have only tested on linux wayland

Broken stuff

• TinyFD isnt available at runtime, so stuff using it is broken rn. I'm gonna replace TinyFD with SDL in the v1 branch for >= 26.3 soon, 1.8.9 can use the same SDL implementation
• legacy-lwjgl3 has IME issues, maybe we should fix
• The MC Item selector using MinecraftItemCatalogService is kinda broken, I'll fix after perf(items): render item icons from a GPU atlas #982

Notes for each commit

feat(legacy): build setup

• All publishing tasks (including compose-bundle) in this branch are restricted to Ornithe 1.8.9, normal builds and CI still cover all versions
• log4j2.xml is needed to work around Fabric Loader JUnit failing in legacy MC

feat(legacy): legacy compat helpers

• Originally I used stonecutter global replacements to map modern methods to legacy, but this was fragile and caused issues
• Stonecutter global replacements are mostly limited to import replacements
• Uses class tweakers so that modern methods work on legacy classes, avoiding inline stonecutter and reducing future merge conflicts
• The interface injections are transitive, so the compatibility methods can be used in other mods using OneConfig
• Access widens the private client task queue to implement modern's Minecraft.tell(), which always defers task execution

feat(legacy): port services

• 1.8.9 framebuffers have no stencil attachment, so BackendRenderTarget.makeGL targets are created with stencilBits = 0

feat(legacy): port compose and rendering

• Copied https://mcasset.cloud/1.13/assets/minecraft/font/default.json (first MC version to include it) to legacy_default.json so that SkiaFontRenderer can use it
• Horizontal scrolling doesn't work unless we mixin into legacy-lwjgl3, but shouldn't matter
• Skia renders directly into main render target
• StoredGLState is taken from ohlunasa's suggested state wrapper with a few additions

feat(legacy): port mixins

• F3 overlay is deferred in Mixin_DebugOverlayAboveUi and replayed after Skia rendering in Mixin_SkiaFrame

feat(legacy): port oneconfig

• Everything works, profile deletion and other stuff that uses TinyFD is broken

feat(legacy): port commands

• Uses brigadier and ClientCommandInternals.java taken and adapted from fabric-api
• Client command suggestions are merged into vanilla tab completion
• Mixin_LegacyChatCompletion applies above default mixin priority for compatibility with AxolotlClient

feat(legacy): port keybinds

• Everything works except IME issues

feat(legacy): port hypixel mod api

• Uses https://github.com/moehreag/HypixelModAPI for compatibility

feat(legacy): title panorama

• Uses an access widener to access MC's private TitleScreen panorama
• Renders and restores the same TitleScreen instance when opening and closing OneConfig, preventing panorama animation jumps
• Copies MC TitleScreen's alpha test toggles and fillGradient()
• Uses StoredGLState to restore GL state, otherwise the compose render afterwards gets corrupted

[Yedelo]

this is a tuff 1,000th issue