Complete 26.3 parity acceptance and dual-version release workflow

ports/mc263/README.md

@@ -1,6 +1,6 @@
-# Minecraft 26.3 beta port workspace
+# Minecraft 26.3
 
-The current **Minecraft 26.3 release is 26.3.0.1**, for NeoForge 26.3.0.99 and
+The current **Minecraft 26.3 release is 26.3.0.3**, for NeoForge 26.3.0.99 and
 Java 25. It uses Rivencraft's first-party Age backend, with no Dynamic Dimensions
 or Bad Packets dependency. The writing loop, authored/seeded Ages, generation
 features, weather/skies/celestials, libraries, crystal portals, live instability,
@@ -16,11 +16,13 @@ with `book_previews.reborn_live_views` in `rivencraft-local.toml`.
 Reborn's Static Sky rendering issue remains tracked in
 [#116](https://git.paddedcell.org/dnorberg/rivencraft/issues/116).
 
-This regular release is player-validated but does not claim complete 1.21.1 parity.
-Issues #100, #103 and #104 retain the final multiplayer/parity/release-workflow
-checks. Preview exploration controls and Create/Ponder scenes remain unported.
-Use matching client/server builds, keep saves separate from 1.21.1 and back up
-before updating. See [release notes](RELEASE_NOTES_26.3.0.1.md).
+The port feature and acceptance review is recorded in
+[the parity review](../../docs/MC263_PARITY_REVIEW.md). Book exploration matches
+1.21.1: use the eye for mouse look inside the book panel and right-click to return;
+movement is disabled. The final dedicated-server restart/return check passed.
+Create/Ponder scenes are not ported to this target. Use matching client/server
+builds, keep saves separate from 1.21.1 and back up before updating.
+See [release notes](RELEASE_NOTES_26.3.0.3.md).
 
 The entries below record how the port was built, including earlier alpha-only
 limitations that were addressed by later slices.