chore: remove issue design note

docs/design/issue-9239-java-25-fabric-compatibility.md

@@ -1,48 +0,0 @@
-# Issue 9239: Java 25 and legacy Fabric compatibility
-
-## Context
-
-Issue #9239 reports that automatic Java selection fails for a Minecraft 1.21.4
-instance, while manually selecting Java 21 succeeds. The supplied PCL log shows
-that PCL selects Java 25 from the official runtime directory because it is first
-in the configured Java list and satisfies the current `[21.0, +infinity)`
-requirement.
-
-Although the issue description says no mods are installed, the supplied launch
-script and crash log show Fabric Loader `0.16.12`. The crash is caused by its
-Mixin/ASM stack attempting to read a Java 25 class (class-file major version
-69), which it does not support.
-
-## Current implementation
-
-- `GetJavaRequirement` in `Plain Craft Launcher 2/Modules/Minecraft/ModJava.vb`
-  assigns Minecraft 1.20.5+ a lower Java bound of 21.
-- Fabric instances only add lower bounds today, so Fabric 0.16.12 retains an
-  unbounded upper range.
-- Automatic selection walks the user-configured Java list and selects the first
-  checked Java in that range. The list sorter prioritizes official runtime
-  locations, making Java 25 selected before installed Java 21 entries.
-
-## Design
-
-For Fabric Loader versions older than `0.17.0`, add an exclusive Java 25 upper
-bound (`< 25.0`) during requirement analysis. This makes Java 21--24 eligible
-for Minecraft 1.21.4 while preventing the known incompatible Java 25 runtime
-from being selected. Fabric Loader 0.17.0 and later retains the existing open
-upper bound so compatible newer loaders may use Java 25.
-
-The boundary is based on the loader-published dependencies: Fabric Loader
-0.16.12 uses ASM 9.7.1, while 0.17.0 upgrades to ASM 9.8 with Java 25
-class-file support.
-
-The constraint is applied only in automatic selection. Explicit Java choices
-and user-defined Java ranges remain authoritative, preserving the existing
-escape hatches for advanced users.
-
-## Verification
-
-- Confirm the 1.21.4/Fabric 0.16.12 requirement becomes `[21.0, 25.0)`.
-- Confirm Java 25 is skipped and Java 21 is selected when both are configured.
-- Confirm a Fabric Loader version at or above 0.17.0 retains its existing
-  Java-version range.
-- Build the solution and review the final diff for scope and regressions.