fixes

injector/crates/loader/build.rs

@@ -0,0 +1,35 @@
+//! Locates the remapped Prestige payload jar (built by `gradlew remapJar`) so lib.rs can embed it with include_bytes!.
+use std::env;
+use std::fs;
+use std::path::PathBuf;
+
+fn main() {
+    println!("cargo:rerun-if-env-changed=PRESTIGE_PAYLOAD");
+    let jar = match env::var("PRESTIGE_PAYLOAD") {
+        Ok(p) => PathBuf::from(p),
+        Err(_) => newest_remapped_jar(),
+    };
+    if !jar.is_file() {
+        panic!("payload jar not found: {} (run `gradlew remapJar` or set PRESTIGE_PAYLOAD)", jar.display());
+    }
+    println!("cargo:rerun-if-changed={}", jar.display());
+    println!("cargo:rustc-env=PRESTIGE_PAYLOAD_JAR={}", jar.display());
+}
+
+fn newest_remapped_jar() -> PathBuf {
+    let libs = PathBuf::from(env::var("CARGO_MANIFEST_DIR").unwrap()).join("../../../build/libs");
+    let mut best: Option<(std::time::SystemTime, PathBuf)> = None;
+    if let Ok(entries) = fs::read_dir(&libs) {
+        for entry in entries.flatten() {
+            let name = entry.file_name().to_string_lossy().to_string();
+            if !name.starts_with("prestige-") || !name.ends_with(".jar") || name.ends_with("-dev.jar") || name.ends_with("-sources.jar") {
+                continue;
+            }
+            let time = entry.metadata().and_then(|m| m.modified()).unwrap_or(std::time::UNIX_EPOCH);
+            if best.as_ref().map_or(true, |(t, _)| time > *t) {
+                best = Some((time, entry.path()));
+            }
+        }
+    }
+    best.map(|(_, p)| p).unwrap_or_else(|| libs.join("prestige-0.1.0.jar"))
+}