Prune commentary and stale Rust port notes

scripts/xtask/Cargo.toml

@@ -3,14 +3,7 @@ name = "xtask"
 version = "0.1.0"
 edition = "2024"
 
-# E5 (RUST.md): packages app/shellApp into a signed, installable APK without
-# Gradle driving the assembly (cargo ndk -> javac -> d8 -> aapt2 -> zipalign
-# -> apksigner). No dependencies beyond the standard library: every step
-# below is "run this SDK tool with these arguments and check its exit
-# status," which needs nothing a crate would help with, and every tool
-# invoked is one this project already requires (the NDK, the SDK
-# build-tools, the JDK, `cargo ndk`) -- see AGENTS.md's "new dependencies
-# need a reason."
+# Packages the Compose shell APK directly with existing SDK/JDK tools.
 [[bin]]
 name = "xtask"
 path = "src/main.rs"