Adopt NeoForge 21.1.264 after compatibility testing

docs/MILESTONE_7_COMPATIBILITY_REVIEW.md

@@ -1,7 +1,7 @@
 # Milestone 7 compatibility review (#82)
 
-Reviewed 2026-10-19 for Minecraft 1.21.1. The project compiles against
-NeoForge 21.1.251 and advertises that as its minimum. The official
+Reviewed 2026-10-19 for Minecraft 1.21.1. The project now compiles against
+NeoForge 21.1.264 and advertises that as its minimum. The official
 [NeoForge Maven metadata](https://maven.neoforged.net/releases/net/neoforged/neoforge/maven-metadata.xml)
 lists 21.1.264 as the newest 21.1 release. Its
 [changelog](https://maven.neoforged.net/releases/net/neoforged/neoforge/21.1.264/neoforge-21.1.264-changelog.txt)
@@ -11,15 +11,16 @@ direction/decoding limits (21.1.261), ad-hoc channel identifier limits
 reasons to evaluate an upgrade, but do not by themselves prove Rivencraft and
 its optional integrations work on that loader.
 
-**Decision: keep 21.1.251 as the build target and minimum for now.**
-`./gradlew build runGameTestServer -Pneo_version=21.1.264` compiled and built
-successfully, but the GameTest server repeated its storage-progress display
-without producing test results. The run was stopped; it is neither a pass nor
-evidence of a NeoForge defect. Under the project's stalled-test rule, hand
-the equivalent in-game validation to the player. No 21.1.264 client or
-dedicated-server compatibility pass has been recorded, so do not claim a
-supported upgrade or raise the required version yet. The earlier 21.1.251
-baseline passed 70 required GameTests for release V0.6.6.0.
+**Decision: adopt 21.1.264 beginning with 0.6.6.2.** An override build
+succeeded, but its GameTest server repeated its storage-progress display
+without producing test results. That run was stopped; it is neither a pass nor
+evidence of a NeoForge defect. The player subsequently passed an in-game
+singleplayer test on 21.1.264 with the optional stack, then passed a dedicated
+server test including Immersive Portals travel to a Rivencraft Age. The
+dedicated server also reached the ready state with only the required mods
+before the full optional stack was installed. Both modes used Rivencraft
+0.6.6.1. The earlier 21.1.251 baseline passed 70 required GameTests for
+release V0.6.6.0.
 
 | Dependency | Project baseline | Newest checked 1.21.1 release | Follow-up |
 | --- | --- | --- | --- |
@@ -41,18 +42,12 @@ separate library-artifact comparison came from Create's Maven. Dynamic
 Dimensions was checked on CurseForge. Versions for other Minecraft lines and
 similarly named mods were excluded.
 
-The player reported an in-game pass for the 0.6.6.1 slice on 2026-10-19.
-That confirms the current gameplay change, not the untested 21.1.264
-dedicated-server and optional-mod matrix. The keep decision therefore remains
-unchanged. [Issue #89](https://truenas-scale.tail180fb1.ts.net:8443/dnorberg/rivencraft/issues/89)
-tracks the remaining loader qualification separately.
-
-Before raising the loader target, test a clean 21.1.264 client and dedicated
-server with only the two required dependencies. Create and enter an Age,
-restart and revisit it, and confirm the LEGACY book-preview fallback without
-Create/Immersive Portals. Then test separate optional combinations: JEI;
-Create/Ponder; Immersive Portals alone and with Create; TerraBlender with
-Biomes O' Plenty; Serene Seasons with GlitchCore. In each combination, verify
-startup, book/portal travel, relevant previews or recipe/biome/season behavior,
-and restart. Repeat the baseline with each optional addon absent. Serene's
-GameTest mock-player network limitation requires a real client/server check.
+The full dedicated test stack contained Create/Ponder, Immersive Portals, JEI,
+TerraBlender with Biomes O' Plenty, and Serene Seasons with GlitchCore. The
+server loaded a new `rivencraft:age/test`, and its shutdown log confirms that
+all Overworld, Nether, End, and Age chunks were saved. The player explicitly
+approved 21.1.264 after that test. This does not independently certify every
+optional combination, the LEGACY preview fallback on a client without Create
+and Immersive Portals, or a full restart/rejoin cycle; keep those in the
+regression checklist. Serene's GameTest mock-player network limitation still
+requires real-client checks for seasonal behavior.

docs/PREVIEW_COMPATIBILITY.md

@@ -45,7 +45,7 @@ being captured in the preview.
 
 ## Supported combinations and upstream limits
 
-The compatibility baseline is Minecraft 1.21.1, NeoForge 21.1.251, Create
+The compatibility baseline is Minecraft 1.21.1, NeoForge 21.1.264, Create
 6.0.10, and Immersive Portals 6.0.7. Core Age generation and the `LEGACY`
 backend run without Create or Immersive Portals; the headless GameTest server
 uses that dependency-free path.