Port authored Age features and Star Fissures to 26.3 beta

Advance to 1.0.1.54-beta.1 after player validation. Port material, vegetation, lake, terrain-volume, crystal, Dense Ores and fissure features with saved plans. Update beta documentation and release notes.

Refs #98, #104

ports/mc263/build.gradle

@@ -124,6 +124,9 @@ sourceSets.main.resources.srcDir generatePortLanguage
 tasks.named('processResources', ProcessResources).configure {
     // Reuse the existing sprite and base model without copying binary assets.
     from('../../src/main/resources') {
+        include 'assets/rivencraft/models/block/star_fissure.json'
+        include 'assets/rivencraft/blockstates/star_fissure.json'
+        include 'assets/rivencraft/sounds/linking/link-fissure.ogg'
         include 'assets/rivencraft/textures/item/crystal_shard.png'
         include 'assets/rivencraft/textures/item/page.png'
         include 'assets/rivencraft/textures/item/page_link_panel.png'