Port Baritone to Minecraft 26.2

[Watchedfungus88]

Summary

• update Minecraft, Fabric Loader, and artifact metadata for 26.2
• adapt 26.2 GUI/HUD, block collection, entity type, vector, and removed Mojang Tuple APIs while reusing Baritone's existing Pair
• retarget the client tick, input forwarding, and world-render hooks to the final 26.2 call sites
• migrate path, selection, and beacon rendering to the 26.2 staged vertex-buffer pipeline, preserving depth modes, blend factors, line widths, colors, and visible geometry
• keep packet event and Elytra movement hooks functional against the final 26.2 bytecode

This completes the 26.2 work explored in #11. In particular, rendering is implemented rather than stubbed, and the Elytra hooks remain required and active because the relevant final-26.2 methods and invocation targets are present.

Validation

• JAVA_HOME=/opt/homebrew/opt/openjdk@25/libexec/openjdk.jdk/Contents/Home ./gradlew clean build --console=plain
• all project tests and checks pass
• Fabric and tweaker artifacts both remap, determinize, and complete ProGuard packaging
• Fabric development client reaches the title screen with Baritone initialized and no Mixin injection failures
• Meteor Client 26.2 compiles against the locally published 26.2-SNAPSHOT API artifact
• git diff --check passes