MC 26.2 overhauled rendering significantly. The classes we used don't
exist anymore:
- MultiBufferSource was removed; world line drawing now goes through
SubmitNodeCollector via LevelRenderEvents.COLLECT_SUBMITS — a much
larger rewrite. Defer until next iteration.
- HudLayerRegistrationCallback / IdentifiedLayer / LayeredDraw — replaced
by HudElementRegistry / HudElement / VanillaHudElements. Compass and
watermark deferred until next iteration.
- fabric-key-binding-api-v1 module renamed to fabric-key-mapping-api-v1.
Class is now KeyMappingHelper at net.fabricmc.fabric.api.client.keymapping.v1.
- KeyMapping ctor: last arg is KeyMapping.Category, not a String.
- BlockPos#getCenter removed — construct Vec3 manually.
- ResourceKey#location renamed to identifier (returns Identifier).
- ResourceLocation was renamed to Identifier (in 26.1).
Friends/markers/chat/tab-complete still work; marker_set from friends
shows up as a chat line "[IRC] marker from X @ x, y, z" instead of an
in-world beacon for this iteration.
