chore: remove deprecated kernel source download script

The script was used to download kernel sources for testing but is no longer needed
as we've migrated to a different approach for managing kernel sources. The new
system handles versioning and downloads automatically through our CI pipeline.

.gitignore

@@ -1,4 +1,3 @@
-download.sh
 patch-rejects
 KernelSU-Next
 kernel_patches

download.sh

@@ -1,111 +0,0 @@
-#!/usr/bin/env bash
-set -euo pipefail
-
-# Quick script to download ALL kernel sources used in test builds and name them properly.
-# Folder name format: "<kernel_version>.<sublevel>-<android_version>-lts"
-# Usage: ./download.sh [target_root]
-# Example: ./download.sh ./kernel_sources_lts
-
-TARGET_ROOT=${1:-"./kernel_sources_lts"}
-
-# Ensure target root exists
-mkdir -p "$TARGET_ROOT"
-
-# Require the 'repo' tool to be installed and available in PATH
-if ! command -v repo >/dev/null 2>&1; then
-  echo "Error: 'repo' tool is required but not found in PATH." >&2
-  echo "Install instructions: https://source.android.com/docs/setup/build/downloading\n" >&2
-  exit 1
-fi
-
-REPO=$(command -v repo)
-
-# Determine CPU count for parallel sync
-CPU_COUNT() {
-  if command -v nproc >/dev/null 2>&1; then
-    nproc
-  elif command -v sysctl >/dev/null 2>&1; then
-    sysctl -n hw.ncpu
-  else
-    echo 4
-  fi
-}
-
-# Branch format used by AOSP kernel manifest
-# common-${android_version}-${kernel_version}-${os_patch_level}
-
-download_one() {
-  local android_version="$1"   # e.g. android14
-  local kernel_version="$2"    # e.g. 6.1
-  local os_patch_level="$3"    # e.g. lts
-
-  local formatted_branch="${android_version}-${kernel_version}-${os_patch_level}"
-  local work_dir="${TARGET_ROOT}/${kernel_version}.X-${android_version}-${os_patch_level}"
-
-  echo "\n=== Downloading sources for ${kernel_version}.X-${android_version}-${os_patch_level} ==="
-  mkdir -p "$work_dir"
-  pushd "$work_dir" >/dev/null
-
-  # Initialize manifest
-  "$REPO" init --depth=1 \
-    --u https://android.googlesource.com/kernel/manifest \
-    -b "common-${formatted_branch}" \
-    --repo-rev=v2.16
-
-  # Handle deprecated branches (matches build.yml logic)
-  local remote_branch
-  remote_branch=$(git ls-remote https://android.googlesource.com/kernel/common "${formatted_branch}" || true)
-  local default_manifest_path=".repo/manifests/default.xml"
-  if echo "$remote_branch" | grep -q deprecated; then
-    sed -i "s/\"${formatted_branch}\"/\"deprecated\/${formatted_branch}\"/g" "$default_manifest_path"
-  fi
-
-  # Sync
-  "$REPO" --trace sync -c -j"$(CPU_COUNT)" --no-tags --fail-fast
-
-  # Extract sublevel from common/Makefile
-  local sublevel="X"
-  if [ -f "common/Makefile" ]; then
-    sublevel=$(grep '^SUBLEVEL = ' common/Makefile | awk '{print $3}') || true
-    if [ -z "$sublevel" ]; then
-      sublevel="X"
-    fi
-  fi
-
-  popd >/dev/null
-
-  # Final name with actual sublevel
-  local final_dir="${TARGET_ROOT}/${kernel_version}.${sublevel}-${android_version}-${os_patch_level}"
-  if [ "$final_dir" != "$work_dir" ]; then
-    mv "$work_dir" "$final_dir"
-  fi
-  echo "Saved to: $final_dir"
-}
-
-# All kernel combinations from test build workflow
-# Android 12 - 5.10
-download_one "android12" "5.10" "2021-08"  # oldest (sub_level: 43)
-download_one "android12" "5.10" "lts"      # LTS
-
-# Android 13 - 5.10
-download_one "android13" "5.10" "2022-04"  # oldest (sub_level: 107)
-download_one "android13" "5.10" "lts"      # LTS
-
-# Android 13 - 5.15
-download_one "android13" "5.15" "2022-06"  # oldest (sub_level: 41)
-download_one "android13" "5.15" "lts"      # LTS
-
-# Android 14 - 5.15
-download_one "android14" "5.15" "2023-06"  # oldest (sub_level: 110)
-download_one "android14" "5.15" "lts"      # LTS
-
-# Android 14 - 6.1
-download_one "android14" "6.1" "2023-06"   # oldest (sub_level: 25)
-download_one "android14" "6.1" "lts"       # LTS
-download_one "android14" "6.1" "2025-05"   # specific (sub_level: 134)
-
-# Android 15 - 6.6
-download_one "android15" "6.6" "2024-07"   # oldest (sub_level: 30)
-download_one "android15" "6.6" "lts"       # LTS
-
-echo "\nAll kernel sources downloaded to: $TARGET_ROOT"