完善源码构建环境

README.md

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 # Lostblade-1.0.0-decompiled
 
-Fallback decompile of `5fu/mods/[BD]遗忘Lostblade-1.0.0.jar`.
+Decompiled source tree derived from `5fu/mods/[BD]遗忘Lostblade-1.0.0.jar`.
 
 - Detected modid(s): `unknown`
-- Original jar: `original/[BD]遗忘Lostblade-1.0.0.jar`
+- Source provenance jar, not used by the build entry: `original/[BD]遗忘Lostblade-1.0.0.jar`
 - Decompiled Java: `src/main/java`
 - Extracted resources: `src/main/resources`
 
 Build entries:
 
-- `./build.sh` reliably recreates `build/libs/[BD]遗忘Lostblade-1.0.0.jar` from the preserved original jar.
+- `./build.sh` compiles the current decompiled sources and resources into `build/libs/[BD]遗忘Lostblade-1.0.0.jar`.
 - `./compile-decompiled.sh` attempts to compile the CFR output with Java 8 using jars from `../5fu/mods` and `../_downloaded-deps` as classpath. CFR output for old obfuscated/private mods may require manual cleanup before this succeeds.