Prepare Minecraft 26.3 technical alpha 1.0.1.2-alpha.1

ports/mc263/src/main/templates/META-INF/neoforge.mods.toml

@@ -4,11 +4,13 @@ issueTrackerURL="https://git.paddedcell.org/dnorberg/rivencraft/issues"
 [[mods]]
 modId="${mod_id}"
 version="${mod_version}"
-displayName="${mod_name} 26.3 Port Preview"
+displayName="${mod_name} 26.3 Alpha"
 displayURL="https://git.paddedcell.org/dnorberg/rivencraft"
 authors="dnorberg and contributors"
 description='''
-Incomplete Minecraft 26.3 development slice. Not for gameplay or distribution.
+Experimental Minecraft 26.3 alpha. Provides a runtime Age prototype and basic
+Linking Book travel. Most Rivencraft gameplay has not yet been ported. Use a
+test world and keep backups; this alpha is not compatible with 1.21.1 worlds.
 '''
 
 [[dependencies.${mod_id}]]