Prepare Minecraft 26.3 technical alpha 1.0.1.2-alpha.1

ports/mc263/README.md

@@ -1,14 +1,13 @@
 # Minecraft 26.3 port workspace
 
-This is an **incomplete mod port** for issues #97–#103. It currently registers
-the Crystal Shard and Crystal Block to verify NeoForge 26.3 loading, block and
-item registration, and modern item resources. It also has a server-only
-runtime Age prototype: the operator-only `rivencraft_port age create <name>
-<seed>`, `list`, and `sample <name>` commands exercise separate vanilla-terrain
-levels with persisted seeds. Authored generators, book binding and client
-dimension synchronization are **not** ported, so it is not playable. Its JAR
-task is disabled. Do not upload output
-from this directory to Gitea, CurseForge, or Modrinth.
+This is an **experimental alpha port** for issues #97–#104, not gameplay parity
+with the Minecraft 1.21.1 release. It registers basic items and a runtime Age
+prototype with persisted seeds. The operator-only `rivencraft_port age`
+commands create and inspect separate vanilla-terrain levels. Descriptive Book
+travel and named Linking Book binding/travel work as limited probes. Authored
+generation, most content, recipes, workstations, portal systems, modifiers and
+the destination preview renderer remain unported. Use a test world and keep a
+backup; do not substitute this JAR for the 1.21.1 mod or import 1.21.1 saves.
 
 From the repository root:
 
@@ -24,8 +23,8 @@ Minecraft 1.21.1/Java 21 build:
 ./gradlew build
 ```
 
-Continue migrating the actual mod in issues #98–#101. Only enable JAR
-assembly once the dual-version validation in #103 is complete.
+The alpha JAR is under `ports/mc263/build/libs`. Continue the port and its
+full dual-version validation in issues #98–#104 before calling 26.3 stable.
 
 The dedicated development server uses `build/run-server`, with its own world
 and properties. Set a nonconflicting `server-port` there before running if