Release 26.3.0.1 with live Reborn views and random page policies

ports/mc263/TESTING_1.0.1.140-beta.1.md

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+# Portal fork runtime compatibility — 1.0.1.140-beta.1
+
+Candidate downloads for Minecraft 26.3 / NeoForge:
+- Immersive Portals Reborn 7.0.12:
+  https://www.curseforge.com/minecraft/mc-mods/immersive-portals-reborn-unofficial-fork/files/9435354
+  Version 7.0.18 is Fabric, so use the NeoForge 7.0.12 file for this test.
+- Seamless latest file 9218525:
+  https://www.curseforge.com/minecraft/mc-mods/immersive-portal/files/9218525
+  Display name is 10.0.0, but its downloaded filename/internal version remain 1.0.0.
+  This exactly matches the user's installed working JAR.
+
+Use ONE portal fork per instance: they share engine classes and mixins.
+Prism files were left unchanged. Install matching Rivencraft builds on both sides
+for dedicated testing. Current tested loader is NeoForge 26.3.0.99.
+
+1. Enable/install the chosen fork and Rivencraft .140.
+2. Create an authored Descriptive Book after joining, using a distinctive sky and
+   lighting. Travel into its newly created Age without reconnecting.
+3. Return using a bound Linking Book and test a second freshly created Age.
+4. Restart and revisit both Ages. Check for unknown/unloaded-dimension rejection,
+   disconnects or incorrect sky/lighting.
+5. Test existing crystal portals through the usual Rivencraft fallback path.
+
+This slice synchronizes runtime Ages and native metadata. Live book panels and
+live crystal portal surfaces are NOT ported yet; animated fallbacks are expected.
+Actual client travel/packet handling needs your check. Server lifecycle, packet
+serialization and restart checks passed with both Reborn and latest Seamless
+(32 lifecycle/packet plus 15 restart checks each). NeoForge .102 is a candidate for a later isolated upgrade
+check; the project target has not been changed yet.