WHC Shell: keyboard-first Android terminal over SSH to local Termux

Vendored Termux terminal-emulator/renderer (Apache 2.0) with kitty keyboard
protocol, modifyOtherKeys and any-event mouse tracking; sshj client with
Ed25519 key login and TOFU host keys; Termux font/colors/cursor sync;
mouse selection, context menu, zoom and fullscreen shortcuts.

shell.nix

@@ -0,0 +1,27 @@
+{ pkgs ? import <nixpkgs> {
+    config = {
+      allowUnfree = true;
+      android_sdk.accept_license = true;
+    };
+  }
+}:
+
+let
+  buildTools = "35.0.0";
+  android = pkgs.androidenv.composeAndroidPackages {
+    platformVersions = [ "35" ];
+    buildToolsVersions = [ buildTools ];
+    includeEmulator = false;
+    includeSystemImages = false;
+    includeNDK = false;
+  };
+  sdk = "${android.androidsdk}/libexec/android-sdk";
+in
+pkgs.mkShell {
+  packages = [ pkgs.jdk17 pkgs.gradle android.androidsdk pkgs.android-tools ];
+  ANDROID_HOME = sdk;
+  ANDROID_SDK_ROOT = sdk;
+  JAVA_HOME = pkgs.jdk17.home;
+  # The aapt2 that Gradle fetches from Maven is not runnable on NixOS.
+  GRADLE_OPTS = "-Dorg.gradle.project.android.aapt2FromMavenOverride=${sdk}/build-tools/${buildTools}/aapt2";
+}