diff --git a/.github/workflows/ci-fast.yml b/.github/workflows/ci-fast.yml
deleted file mode 100644
index 6d110a051..000000000
--- a/.github/workflows/ci-fast.yml
+++ /dev/null
@@ -1,24 +0,0 @@
-name: CI Fast
-
-on:
-  push:
-    branches: [master, beta]
-  pull_request:
-    branches: [master, beta]
-
-concurrency:
-  group: ci-fast-${{ github.ref }}
-  cancel-in-progress: true
-
-jobs:
-  build-and-test:
-    runs-on: ubuntu-latest
-    steps:
-      - uses: actions/checkout@v4
-      - name: devbox installer
-        uses: jetify-com/devbox-install-action@v0.14.0
-        with:
-          project-path: shells/devbox-fast.json
-          enable-cache: 'false'
-      - name: build
-        run: devbox run --config=shells/devbox-fast.json build
diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
new file mode 100644
index 000000000..866948e43
--- /dev/null
+++ b/.github/workflows/ci.yml
@@ -0,0 +1,47 @@
+name: CI
+
+on:
+  push:
+    branches: [master, beta]
+  pull_request:
+    branches: [master, beta]
+
+concurrency:
+  group: ci-${{ github.ref }}
+  cancel-in-progress: true
+
+jobs:
+  ci:
+    name: Lint + Build + Test
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - name: Install devbox
+        uses: jetify-com/devbox-install-action@v0.14.0
+      - name: Install dependencies
+        run: devbox run ci:install
+      - name: Lint (eslint)
+        run: devbox run lint
+      - name: Lint (formatting)
+        run: devbox run format-check
+      - name: Build
+        run: devbox run build
+      - name: Typecheck
+        run: devbox run typecheck
+      - name: Test
+        run: devbox run test
+
+  commitlint:
+    name: Commitlint
+    if: github.event_name == 'pull_request'
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - name: Install devbox
+        uses: jetify-com/devbox-install-action@v0.14.0
+      - name: Install dependencies
+        run: devbox run ci:install
+      - name: Validate PR title
+        run: devbox run ci:commitlint
+        env:
+          PR_TITLE: ${{ github.event.pull_request.title }}
diff --git a/.github/workflows/release.yml b/.github/workflows/release.yml
index 49fcc8783..bec246d31 100644
--- a/.github/workflows/release.yml
+++ b/.github/workflows/release.yml
@@ -17,22 +17,29 @@ concurrency:
   cancel-in-progress: true
 
 jobs:
-  fast-checks:
-    name: Build + Lint
+  ci:
+    name: Lint + Build + Test
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v4
-      - name: devbox installer
+      - name: Install devbox
         uses: jetify-com/devbox-install-action@v0.14.0
-        with:
-          project-path: shells/devbox-fast.json
-          enable-cache: 'false'
-      - name: build
-        run: devbox run --config=shells/devbox-fast.json build
+      - name: Install dependencies
+        run: devbox run ci:install
+      - name: Lint (eslint)
+        run: devbox run lint
+      - name: Lint (formatting)
+        run: devbox run format-check
+      - name: Build
+        run: devbox run build
+      - name: Typecheck
+        run: devbox run typecheck
+      - name: Test
+        run: devbox run test
 
   release:
     name: Release (${{ inputs.type }})
-    needs: [fast-checks]
+    needs: [ci]
     runs-on: ubuntu-latest
     environment: Publish
     permissions:
@@ -52,30 +59,27 @@ jobs:
           git checkout -B beta HEAD
           git push origin beta --force
 
-      - name: devbox installer
+      - name: Install devbox
         uses: jetify-com/devbox-install-action@v0.14.0
-        with:
-          project-path: shells/devbox-fast.json
-          enable-cache: 'false'
 
       - name: Release (dry-run)
         if: inputs.type == 'dry-run'
-        run: devbox run --config=shells/devbox-fast.json release-dry-run
+        run: devbox run release-dry-run
         env:
           GH_TOKEN: ${{ github.token }}
 
       - name: Release (beta)
         if: inputs.type == 'beta'
-        run: devbox run -e GITHUB_REF=refs/heads/beta --config=shells/devbox-fast.json release
+        run: devbox run -e GITHUB_REF=refs/heads/beta release
         env:
           GH_TOKEN: ${{ github.token }}
 
       - name: Release (production)
         if: inputs.type == 'production'
-        run: devbox run --config=shells/devbox-fast.json release
+        run: devbox run release
         env:
           GH_TOKEN: ${{ github.token }}
 
       - name: Update Apps
         if: inputs.type == 'production'
-        run: devbox run --config=shells/devbox-fast.json update-apps
+        run: devbox run update-apps
diff --git a/.husky/pre-commit b/.husky/pre-commit
index a1828f9ab..921e95cb1 100755
--- a/.husky/pre-commit
+++ b/.husky/pre-commit
@@ -1,4 +1,4 @@
 #!/usr/bin/env sh
 . "$(dirname -- "$0")/_/husky.sh"
 
-yarn lint && yarn typescript && yarn test
+yarn lint && yarn typecheck && yarn test
diff --git a/devbox.json b/devbox.json
index 6dd289314..68104f98b 100644
--- a/devbox.json
+++ b/devbox.json
@@ -5,103 +5,42 @@
       "version": "latest",
       "platforms": ["x86_64-darwin", "aarch64-darwin"]
     },
+    "nodejs": "22",
     "yarn-berry": "latest",
+    "jq": "latest",
     "treefmt": "latest",
     "nixfmt": "latest",
-    "shfmt": "latest",
-    "jdk17": "latest",
-    "gradle": "latest",
-    "jq": "latest",
-    "netcat": "latest",
-    "path:./nix#android-sdk": ""
+    "shfmt": "latest"
   },
   "shell": {
     "init_hook": [
-      "echo 'Welcome to analytics-react-native devbox!' > /dev/null",
-      ". $DEVBOX_PROJECT_ROOT/scripts/shared/common.sh",
-      "if [ \"$(uname -s)\" = \"Darwin\" ]; then . $DEVBOX_PROJECT_ROOT/scripts/ios/env.sh; fi",
-      ". $DEVBOX_PROJECT_ROOT/scripts/android/env.sh",
-      "echo 'Android SDK env configured (details: wiki/devbox.md#devbox-android).'"
+      "export PROJECT_ROOT=\"$(git rev-parse --show-toplevel 2>/dev/null || echo $DEVBOX_PROJECT_ROOT)\"",
+      "export PATH=\"$PROJECT_ROOT/node_modules/.bin:$PATH\"",
+      "if [ ! -d \"$PROJECT_ROOT/node_modules\" ]; then echo 'Running yarn install...'; yarn install; fi",
+      "if [ ! -f \"$PROJECT_ROOT/packages/core/src/info.ts\" ]; then yarn core prebuild; fi",
+      "if [ ! -d \"$PROJECT_ROOT/.husky/_\" ]; then yarn husky install; fi"
     ],
     "scripts": {
-      "clean": [
-        "rm -rf $DEVBOX_PROJECT_ROOT/examples/E2E/ios/Podfile.lock",
-        "rm -rf $DEVBOX_PROJECT_ROOT/examples/E2E/ios/Pods",
-        "cd $DEVBOX_PROJECT_DIR/examples/E2E/android && gradle clean",
-        "yarn cache clean",
-        "find $DEVBOX_PROJECT_DIR -type d -name node_modules -exec rmdir {} \\;"
-      ],
-      "build": ["bash $SCRIPTS_DIR/build.sh"],
-      "format": ["treefmt"],
-      "lint": ["treefmt --fail-on-change"],
-      "test-android": ["bash $SCRIPTS_DIR/android/test.sh"],
-      "test-ios": ["bash $SCRIPTS_DIR/ios/test.sh"],
-      "act-ci": [
-        "bash $SCRIPTS_DIR/act-ci.sh --platform ubuntu-latest=ghcr.io/catthehacker/ubuntu:act-24.04"
-      ],
-      "setup-android": ["bash $SCRIPTS_DIR/android/setup.sh"],
-      "setup-ios": ["bash $SCRIPTS_DIR/ios/setup.sh"],
-      "start-emulator": ["bash $SCRIPTS_DIR/android/manager.sh start"],
-      "start-ios": ["bash $SCRIPTS_DIR/ios/manager.sh start"],
-      "start-android-minsdk": ["bash $SCRIPTS_DIR/android/manager.sh start"],
-      "start-android-latest": [
-        "AVD_FLAVOR=latest bash $SCRIPTS_DIR/android/manager.sh start"
-      ],
-      "start-android": ["bash $SCRIPTS_DIR/android/manager.sh start"],
+      "ci:install": ["yarn install --immutable"],
+      "ci:commitlint": ["bash -c 'echo \"$PR_TITLE\" | yarn commitlint'"],
+      "build": ["yarn build"],
+      "test": ["yarn test"],
+      "typecheck": ["yarn typecheck"],
+      "lint": ["yarn lint"],
+      "format": ["yarn format"],
+      "format-check": ["yarn format:check"],
+      "clean": ["yarn clean"],
+      "release": ["yarn install --immutable", "yarn build", "yarn release"],
+      "release-dry-run": [
+        "yarn install --immutable",
+        "yarn build",
+        "yarn multi-semantic-release --dry-run"
+      ],
+      "sync-versions": ["bash $PROJECT_ROOT/scripts/sync-versions.sh"],
       "update-apps": [
         "yarn install --no-immutable",
-        "yarn e2e install --no-immutable",
         "yarn example install --no-immutable"
-      ],
-      "update-shells": [
-        "devbox update",
-        "devbox update --config=shells/devbox-fast.json",
-        "devbox update --config=shells/devbox-android.json",
-        "devbox update --config=shells/devbox-ios.json"
-      ],
-      "reset-android": [
-        "rm -rf ~/.android/avd",
-        "rm -f ~/.android/adbkey*",
-        "echo \"AVDs and adb keys removed. Recreate via devbox run start-android* as needed.\""
-      ],
-      "reset-ios": [
-        "xcrun simctl shutdown all || true",
-        "xcrun simctl erase all || true",
-        "xcrun simctl delete all || true",
-        "xcrun simctl delete unavailable || true",
-        "killall -9 com.apple.CoreSimulatorService 2>/dev/null || true",
-        "echo \"Simulators reset via simctl. Recreate via devbox run start-ios.\""
-      ],
-      "stop-android": [
-        "if command -v adb >/dev/null 2>&1; then",
-        "  devices=$(adb devices -l 2>/dev/null | tail -n +2 | awk '{print $1}' | tr '\\n' ' ');",
-        "  if [[ -n \"$devices\" ]]; then",
-        "    echo \"Stopping Android emulators: $devices\";",
-        "    for d in $devices; do adb -s \"$d\" emu kill >/dev/null 2>&1 || true; done;",
-        "  else",
-        "    echo \"No Android emulators detected via adb.\";",
-        "  fi;",
-        "else",
-        "  echo \"adb not found; skipping Android emulator shutdown.\";",
-        "fi",
-        "pkill -f \"emulator@\" >/dev/null 2>&1 || true",
-        "echo \"Android emulators stopped (if any were running).\""
-      ],
-      "stop-ios": [
-        "if command -v xcrun >/dev/null 2>&1 && xcrun -f simctl >/dev/null 2>&1; then",
-        "  if xcrun simctl list devices booted | grep -q \"Booted\"; then",
-        "    echo \"Shutting down booted iOS simulators...\";",
-        "    xcrun simctl shutdown all >/dev/null 2>&1 || true;",
-        "  else",
-        "    echo \"No booted iOS simulators detected.\";",
-        "  fi;",
-        "else",
-        "  echo \"simctl not available; skipping iOS shutdown.\";",
-        "fi",
-        "echo \"iOS simulators shutdown (if any were running).\""
-      ],
-      "stop": ["devbox run stop-android", "devbox run stop-ios"],
-      "test": ["devbox run test-android", "devbox run test-ios"]
+      ]
     }
   }
 }
diff --git a/nix/flake.lock b/nix/flake.lock
deleted file mode 100644
index d1f4e1080..000000000
--- a/nix/flake.lock
+++ /dev/null
@@ -1,27 +0,0 @@
-{
-  "nodes": {
-    "nixpkgs": {
-      "locked": {
-        "lastModified": 1769527094,
-        "narHash": "sha256-xV20Alb7ZGN7qujnsi5lG1NckSUmpIb05H2Xar73TDc=",
-        "owner": "NixOS",
-        "repo": "nixpkgs",
-        "rev": "afce96367b2e37fc29afb5543573cd49db3357b7",
-        "type": "github"
-      },
-      "original": {
-        "owner": "NixOS",
-        "ref": "nixpkgs-unstable",
-        "repo": "nixpkgs",
-        "type": "github"
-      }
-    },
-    "root": {
-      "inputs": {
-        "nixpkgs": "nixpkgs"
-      }
-    }
-  },
-  "root": "root",
-  "version": 7
-}
diff --git a/nix/flake.nix b/nix/flake.nix
deleted file mode 100644
index 06ff87380..000000000
--- a/nix/flake.nix
+++ /dev/null
@@ -1,74 +0,0 @@
-{
-  description = "Slim Android SDK tools for Devbox via flakes";
-
-  inputs.nixpkgs.url = "github:NixOS/nixpkgs/nixpkgs-unstable";
-
-  outputs =
-    { self, nixpkgs }:
-    let
-      systems = [
-        "x86_64-linux"
-        "aarch64-linux"
-        "x86_64-darwin"
-        "aarch64-darwin"
-      ];
-
-      versionData = builtins.fromJSON (builtins.readFile ./platform-versions.json);
-      getVar =
-        name: default:
-        if builtins.hasAttr name versionData then toString (builtins.getAttr name versionData) else default;
-
-      androidSdkConfig = {
-        platformVersions = [
-          (getVar "PLATFORM_ANDROID_MIN_API" "21")
-          (getVar "PLATFORM_ANDROID_MAX_API" "33")
-        ];
-        buildToolsVersion = getVar "PLATFORM_ANDROID_BUILD_TOOLS_VERSION" "30.0.3";
-        cmdLineToolsVersion = getVar "PLATFORM_ANDROID_CMDLINE_TOOLS_VERSION" "19.0";
-        systemImageTypes = [ (getVar "PLATFORM_ANDROID_SYSTEM_IMAGE_TAG" "google_apis") ];
-      };
-
-      forAllSystems =
-        f:
-        builtins.listToAttrs (
-          map (system: {
-            name = system;
-            value = f system;
-          }) systems
-        );
-    in
-    {
-      packages = forAllSystems (
-        system:
-        let
-          pkgs = import nixpkgs {
-            inherit system;
-            config = {
-              allowUnfree = true;
-              android_sdk.accept_license = true;
-            };
-          };
-
-          abiVersions = if builtins.match "aarch64-.*" system != null then [ "arm64-v8a" ] else [ "x86_64" ];
-
-          androidPkgs = pkgs.androidenv.composeAndroidPackages {
-            # Keep API 21 images for the AVD and add API 33 for React Native builds.
-            platformVersions = androidSdkConfig.platformVersions;
-            buildToolsVersions = [ androidSdkConfig.buildToolsVersion ];
-            cmdLineToolsVersion = androidSdkConfig.cmdLineToolsVersion;
-            includeEmulator = true;
-            includeSystemImages = true;
-            includeNDK = false;
-            abiVersions = abiVersions;
-            systemImageTypes = androidSdkConfig.systemImageTypes;
-          };
-        in
-        {
-          android-sdk = androidPkgs.androidsdk;
-          default = androidPkgs.androidsdk;
-        }
-      );
-
-      androidSdkConfig = androidSdkConfig;
-    };
-}
diff --git a/nix/platform-versions.json b/nix/platform-versions.json
deleted file mode 100644
index 506669900..000000000
--- a/nix/platform-versions.json
+++ /dev/null
@@ -1,13 +0,0 @@
-{
-  "PLATFORM_ANDROID_MIN_API": "21",
-  "PLATFORM_ANDROID_MAX_API": "33",
-  "PLATFORM_ANDROID_BUILD_TOOLS_VERSION": "30.0.3",
-  "PLATFORM_ANDROID_CMDLINE_TOOLS_VERSION": "19.0",
-  "PLATFORM_ANDROID_SYSTEM_IMAGE_TAG": "google_apis",
-  "PLATFORM_ANDROID_MIN_DEVICE": "pixel",
-  "PLATFORM_ANDROID_MAX_DEVICE": "medium_phone",
-  "PLATFORM_IOS_MIN_RUNTIME": "15.0",
-  "PLATFORM_IOS_MAX_RUNTIME": "",
-  "PLATFORM_IOS_MIN_DEVICE": "iPhone 13",
-  "PLATFORM_IOS_MAX_DEVICE": "iPhone 17"
-}
diff --git a/package.json b/package.json
index 30af344e2..a512acf99 100644
--- a/package.json
+++ b/package.json
@@ -8,20 +8,16 @@
     "packages/plugins/*"
   ],
   "scripts": {
-    "bootstrap": "yarn install && yarn example install && yarn example pods && yarn e2e install && yarn e2e pods && husky install",
-    "bootstrap:ci": "yarn install && yarn e2e install && yarn e2e pods && husky install",
     "core": "yarn workspace @segment/analytics-react-native",
     "sovran": "yarn workspace @segment/sovran-react-native",
     "example": "yarn --cwd examples/AnalyticsReactNativeExample",
-    "e2e": "yarn --cwd examples/E2E",
     "build": "yarn workspaces foreach -A -p --topological-dev run build",
-    "testAll": "yarn workspaces foreach -A -p run test --passWithNoTests",
-    "clean": "yarn workspaces foreach -A -p run clean",
-    "typescript": "tsc --noEmit --composite false",
     "test": "jest",
+    "typecheck": "tsc --noEmit --composite false",
     "lint": "eslint .",
     "format": "treefmt --clear-cache",
     "format:check": "treefmt --clear-cache --fail-on-change",
+    "clean": "yarn workspaces foreach -A -p run clean",
     "release": "yarn multi-semantic-release"
   },
   "devDependencies": {
diff --git a/packages/core/src/__tests__/api.test.ts b/packages/core/src/__tests__/api.test.ts
index 86a378752..f968a3201 100644
--- a/packages/core/src/__tests__/api.test.ts
+++ b/packages/core/src/__tests__/api.test.ts
@@ -64,6 +64,7 @@ describe('#sendEvents', () => {
 
     expect(fetch).toHaveBeenCalledWith(toUrl, {
       method: 'POST',
+      keepalive: true,
       body: JSON.stringify({
         batch: [event],
         sentAt: '2001-01-01T00:00:00.000Z',
diff --git a/scripts/act-ci.sh b/scripts/act-ci.sh
deleted file mode 100755
index 60c7f85a9..000000000
--- a/scripts/act-ci.sh
+++ /dev/null
@@ -1,46 +0,0 @@
-#!/usr/bin/env bash
-set -euo pipefail
-
-# Run GitHub Actions workflows locally via act.
-# Usage: scripts/act-ci.sh [--job JOB] [--platform ubuntu-latest=IMAGE]
-
-JOB=""
-PLATFORMS=()
-
-host_arch="$(uname -m)"
-if [[ $host_arch == "arm64" || $host_arch == "aarch64" ]]; then
-  PLATFORMS+=("ubuntu-24.04-arm=ghcr.io/catthehacker/ubuntu:act-24.04")
-else
-  PLATFORMS+=("ubuntu-24.04=ghcr.io/catthehacker/ubuntu:act-24.04")
-fi
-PLATFORMS+=("ubuntu-latest=ghcr.io/catthehacker/ubuntu:act-24.04")
-
-while [[ $# -gt 0 ]]; do
-  case "$1" in
-  -j | --job)
-    JOB="$2"
-    shift 2
-    ;;
-  -p | --platform)
-    PLATFORMS+=("$2")
-    shift 2
-    ;;
-  *)
-    echo "Unknown option: $1" >&2
-    exit 1
-    ;;
-  esac
-done
-
-CMD=(act)
-CMD+=(--pull=false)
-for platform in "${PLATFORMS[@]}"; do
-  CMD+=(--platform "$platform")
-done
-CMD+=(--input ACT=true)
-if [[ -n $JOB ]]; then
-  CMD+=(--job "$JOB")
-fi
-
-printf 'Running: %s\n' "${CMD[*]}"
-exec "${CMD[@]}"
diff --git a/scripts/android/env.sh b/scripts/android/env.sh
deleted file mode 100755
index 0ffe24379..000000000
--- a/scripts/android/env.sh
+++ /dev/null
@@ -1,82 +0,0 @@
-#!/usr/bin/env bash
-# Sets ANDROID_SDK_ROOT/ANDROID_HOME and PATH to the flake-pinned SDK if not already set.
-
-# Load shared platform versions if present.
-script_path="${BASH_SOURCE[0]:-$0}"
-script_dir="$(cd "$(dirname "$script_path")" && pwd)"
-# shellcheck disable=SC1090
-. "$script_dir/../shared/common.sh"
-load_platform_versions "$script_dir"
-
-if [ -z "${ANDROID_MIN_API:-}" ] && [ -n "${PLATFORM_ANDROID_MIN_API:-}" ]; then
-  ANDROID_MIN_API="$PLATFORM_ANDROID_MIN_API"
-fi
-if [ -z "${ANDROID_MAX_API:-}" ] && [ -n "${PLATFORM_ANDROID_MAX_API:-}" ]; then
-  ANDROID_MAX_API="$PLATFORM_ANDROID_MAX_API"
-fi
-if [ -z "${ANDROID_BUILD_TOOLS_VERSION:-}" ] && [ -n "${PLATFORM_ANDROID_BUILD_TOOLS_VERSION:-}" ]; then
-  ANDROID_BUILD_TOOLS_VERSION="$PLATFORM_ANDROID_BUILD_TOOLS_VERSION"
-fi
-if [ -z "${ANDROID_CMDLINE_TOOLS_VERSION:-}" ] && [ -n "${PLATFORM_ANDROID_CMDLINE_TOOLS_VERSION:-}" ]; then
-  ANDROID_CMDLINE_TOOLS_VERSION="$PLATFORM_ANDROID_CMDLINE_TOOLS_VERSION"
-fi
-if [ -z "${ANDROID_SYSTEM_IMAGE_TAG:-}" ] && [ -n "${PLATFORM_ANDROID_SYSTEM_IMAGE_TAG:-}" ]; then
-  ANDROID_SYSTEM_IMAGE_TAG="$PLATFORM_ANDROID_SYSTEM_IMAGE_TAG"
-fi
-
-# Only act if neither var is already provided.
-if [ -z "${ANDROID_SDK_ROOT:-}" ] && [ -z "${ANDROID_HOME:-}" ]; then
-  DEVBOX_SDK_OUT=$(
-    nix --extra-experimental-features 'nix-command flakes' \
-      eval --raw "path:${DEVBOX_PROJECT_ROOT}/nix#android-sdk.outPath" 2>/dev/null || true
-  )
-  if [ -n "${DEVBOX_SDK_OUT:-}" ] && [ -d "$DEVBOX_SDK_OUT/libexec/android-sdk" ]; then
-    ANDROID_SDK_ROOT="$DEVBOX_SDK_OUT/libexec/android-sdk"
-    ANDROID_HOME="$ANDROID_SDK_ROOT"
-  fi
-fi
-
-if [ -z "${ANDROID_SDK_ROOT:-}" ] && [ -n "${ANDROID_HOME:-}" ]; then
-  ANDROID_SDK_ROOT="$ANDROID_HOME"
-fi
-
-if [ -n "${ANDROID_SDK_ROOT:-}" ] && [ -z "${ANDROID_HOME:-}" ]; then
-  ANDROID_HOME="$ANDROID_SDK_ROOT"
-fi
-
-export ANDROID_SDK_ROOT ANDROID_HOME
-export ANDROID_BUILD_TOOLS_VERSION
-
-if [ -n "${ANDROID_SDK_ROOT:-}" ]; then
-  # Prefer cmdline-tools;latest, or fall back to the highest numbered cmdline-tools folder.
-  cmdline_tools_bin=""
-  if [ -d "$ANDROID_SDK_ROOT/cmdline-tools/latest/bin" ]; then
-    cmdline_tools_bin="$ANDROID_SDK_ROOT/cmdline-tools/latest/bin"
-  else
-    cmdline_tools_dir=$(find "$ANDROID_SDK_ROOT/cmdline-tools" -maxdepth 1 -mindepth 1 -type d -not -name latest 2>/dev/null | sort -V | tail -n 1)
-    if [ -n "${cmdline_tools_dir:-}" ] && [ -d "$cmdline_tools_dir/bin" ]; then
-      cmdline_tools_bin="$cmdline_tools_dir/bin"
-    fi
-  fi
-
-  new_path="$ANDROID_SDK_ROOT/emulator:$ANDROID_SDK_ROOT/platform-tools"
-
-  if [ -n "${cmdline_tools_bin:-}" ]; then
-    new_path="$new_path:$cmdline_tools_bin"
-  fi
-
-  new_path="$new_path:$ANDROID_SDK_ROOT/tools/bin:$PATH"
-  PATH="$new_path"
-  export PATH
-  echo "Using Android SDK: $ANDROID_SDK_ROOT"
-  case "$ANDROID_SDK_ROOT" in
-  /nix/store/*)
-    echo "Source: Nix flake (reproducible, pinned). To use your local SDK instead, set ANDROID_HOME/ANDROID_SDK_ROOT before starting devbox shell."
-    ;;
-  *)
-    echo "Source: User/local SDK. To use the pinned Nix SDK, unset ANDROID_HOME/ANDROID_SDK_ROOT before starting devbox shell."
-    ;;
-  esac
-else
-  echo "Android SDK not set; using system PATH"
-fi
diff --git a/scripts/android/manager.sh b/scripts/android/manager.sh
deleted file mode 100755
index a1275adb6..000000000
--- a/scripts/android/manager.sh
+++ /dev/null
@@ -1,57 +0,0 @@
-#!/usr/bin/env bash
-set -euo pipefail
-
-action="${1:-}"
-shift || true
-
-source "$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)/env.sh"
-
-start_android() {
-  local flavor="${AVD_FLAVOR:-latest}" headless="${EMU_HEADLESS:-}" port="${EMU_PORT:-5554}"
-  local avd="${DETOX_AVD:-}"
-
-  if [[ -z $avd ]]; then
-    if [[ $flavor == "latest" ]]; then
-      local host_arch
-      host_arch="$(uname -m)"
-      avd="medium_phone_API33_$([[ $host_arch == "arm64" || $host_arch == "aarch64" ]] && echo arm64_v8a || echo x86_64)"
-    else
-      avd="pixel_API21_$(uname -m | grep -qi arm && echo arm64_v8a || echo x86_64)"
-    fi
-  fi
-
-  devbox run setup-android
-  local target_serial="emulator-${port}"
-  if command -v adb >/dev/null 2>&1; then
-    adb devices | awk 'NR>1 && $2=="offline" {print $1}' | while read -r d; do adb -s "$d" emu kill >/dev/null 2>&1 || true; done
-  fi
-  echo "Starting Android emulator: ${avd} (flavor ${flavor}, port ${port}, headless=${headless:-0})"
-  emulator -avd "${avd}" ${headless:+-no-window} -port "${port}" -gpu swiftshader_indirect -noaudio -no-boot-anim -camera-back none -accel on -writable-system -no-snapshot-save &
-  adb -s "${target_serial}" wait-for-device
-  local boot_completed=""
-  until [ "$boot_completed" = "1" ]; do
-    boot_completed=$(adb -s "${target_serial}" shell getprop sys.boot_completed 2>/dev/null | tr -d "\r")
-    sleep 5
-  done
-  adb -s "${target_serial}" shell settings put global window_animation_scale 0
-  adb -s "${target_serial}" shell settings put global transition_animation_scale 0
-  adb -s "${target_serial}" shell settings put global animator_duration_scale 0
-}
-
-stop_android() {
-  devbox run stop-android
-}
-
-reset_android() {
-  devbox run reset-android
-}
-
-case "$action" in
-start) start_android ;;
-stop) stop_android ;;
-reset) reset_android ;;
-*)
-  echo "Usage: manager.sh {start|stop|reset}" >&2
-  exit 1
-  ;;
-esac
diff --git a/scripts/android/setup.sh b/scripts/android/setup.sh
deleted file mode 100755
index ffc0b7cef..000000000
--- a/scripts/android/setup.sh
+++ /dev/null
@@ -1,150 +0,0 @@
-#!/usr/bin/env bash
-set -euo pipefail
-
-# Creates AVDs using the Android SDK provided by devbox/flake (system images, emulator, NDK already installed).
-# Run inside a devbox shell so SDK tools are available.
-# Configurable via env:
-#   AVD_API (default 21)
-#   AVD_DEVICE (default "pixel")
-#   AVD_TAG (default "google_apis")
-#   AVD_ABI (preferred ABI; optional)
-#   AVD_NAME (override final AVD name; otherwise computed)
-# Secondary AVD (created in addition to the primary):
-#   AVD_SECONDARY_API (default 33)
-#   AVD_SECONDARY_DEVICE (default "medium_phone")
-#   AVD_SECONDARY_TAG (default "google_apis")
-#   AVD_SECONDARY_ABI (preferred ABI; optional)
-#   AVD_SECONDARY_NAME (override final name)
-
-script_dir="$(cd "$(dirname "$0")" && pwd)"
-# shellcheck disable=SC1090
-. "$script_dir/../shared/common.sh"
-load_platform_versions "$script_dir"
-
-detect_sdk_root() {
-  if [[ -n ${ANDROID_SDK_ROOT:-} ]]; then
-    echo "$ANDROID_SDK_ROOT"
-    return
-  fi
-
-  local sm
-  sm="$(command -v sdkmanager 2>/dev/null || true)"
-  if [[ -z $sm ]]; then
-    return
-  fi
-  sm="$(readlink -f "$sm")"
-  local candidates=(
-    "$(dirname "$sm")/.."
-    "$(dirname "$sm")/../share/android-sdk"
-    "$(dirname "$sm")/../libexec/android-sdk"
-    "$(dirname "$sm")/../.."
-  )
-  for c in "${candidates[@]}"; do
-    if [[ -d "$c/platform-tools" || -d "$c/platforms" || -d "$c/system-images" ]]; then
-      echo "$c"
-      return
-    fi
-  done
-}
-
-avd_exists() {
-  local name="$1"
-  avdmanager list avd | grep -q "Name: ${name}"
-}
-
-pick_image() {
-  local api="$1" tag="$2" preferred_abi="$3"
-  local host_arch
-  host_arch="$(uname -m)"
-
-  local candidates=()
-  if [[ -n ${preferred_abi:-} ]]; then
-    candidates=("$preferred_abi")
-  else
-    case "$host_arch" in
-    arm64 | aarch64) candidates=("arm64-v8a" "x86_64" "x86") ;;
-    *) candidates=("x86_64" "x86" "arm64-v8a") ;;
-    esac
-  fi
-
-  for abi in "${candidates[@]}"; do
-    local image="system-images;android-${api};${tag};${abi}"
-    local path="${ANDROID_SDK_ROOT}/system-images/android-${api}/${tag}/${abi}"
-    if [[ -d $path ]]; then
-      echo "$image"
-      return 0
-    fi
-  done
-
-  return 1
-}
-
-create_avd() {
-  local name="$1" device="$2" image="$3"
-  local abi="${image##*;}"
-
-  if avd_exists "$name"; then
-    echo "AVD ${name} already exists."
-    return 0
-  fi
-
-  echo "Creating AVD ${name} with ${image}..."
-  avdmanager create avd --force --name "$name" --package "$image" --device "$device" --abi "$abi" --sdcard 512M
-}
-
-main() {
-  local detected_sdk_root
-  detected_sdk_root="$(detect_sdk_root)"
-
-  if [[ -z ${ANDROID_SDK_ROOT:-} && -n $detected_sdk_root ]]; then
-    export ANDROID_SDK_ROOT="$detected_sdk_root"
-  fi
-
-  if [[ -z ${ANDROID_SDK_ROOT:-} && -z ${ANDROID_HOME:-} ]]; then
-    echo "ANDROID_SDK_ROOT/ANDROID_HOME must be set. In a devbox shell, the flake-provided SDK should supply sdkmanager in PATH; if not, set ANDROID_SDK_ROOT to the flake's android-sdk path." >&2
-    exit 1
-  fi
-
-  export ANDROID_HOME="${ANDROID_HOME:-$ANDROID_SDK_ROOT}"
-
-  require_tool avdmanager
-  require_tool emulator
-
-  local primary_api="${AVD_API:-${ANDROID_MIN_API:-${PLATFORM_ANDROID_MIN_API:-21}}}"
-  local primary_tag="${AVD_TAG:-${ANDROID_SYSTEM_IMAGE_TAG:-${PLATFORM_ANDROID_SYSTEM_IMAGE_TAG:-google_apis}}}"
-  local primary_device="${AVD_DEVICE:-pixel}"
-  local primary_preferred_abi="${AVD_ABI:-}"
-
-  local secondary_api="${AVD_SECONDARY_API:-${ANDROID_MAX_API:-${PLATFORM_ANDROID_MAX_API:-33}}}"
-  local secondary_tag="${AVD_SECONDARY_TAG:-${ANDROID_SYSTEM_IMAGE_TAG:-${PLATFORM_ANDROID_SYSTEM_IMAGE_TAG:-google_apis}}}"
-  local secondary_device="${AVD_SECONDARY_DEVICE:-medium_phone}"
-  local secondary_preferred_abi="${AVD_SECONDARY_ABI:-}"
-
-  local targets=(
-    "$primary_api|$primary_tag|$primary_device|$primary_preferred_abi|${AVD_NAME:-}"
-    "$secondary_api|$secondary_tag|$secondary_device|$secondary_preferred_abi|${AVD_SECONDARY_NAME:-}"
-  )
-
-  for target in "${targets[@]}"; do
-    IFS="|" read -r api tag device preferred_abi name_override <<<"$target"
-
-    local api_image
-    if ! api_image="$(pick_image "$api" "$tag" "$preferred_abi")"; then
-      echo "Expected API ${api} system image (${tag}; preferred ABI ${preferred_abi:-auto}) not found under ${ANDROID_SDK_ROOT}/system-images/android-${api}." >&2
-      echo "Re-enter the devbox shell (flake should provide images) or rebuild Devbox to fetch them." >&2
-      continue
-    fi
-
-    local abi="${api_image##*;}"
-    local avd_name="${name_override:-$(printf '%s_API%s_%s' "$device" "$api" "${abi//-/_}")}"
-
-    create_avd "$avd_name" "$device" "$api_image"
-    if avd_exists "$avd_name"; then
-      echo "AVD ready: ${avd_name} (${api_image})"
-    fi
-  done
-
-  echo "AVDs ready. Boot with: emulator -avd <name> --netdelay none --netspeed full"
-}
-
-main "$@"
diff --git a/scripts/android/test.sh b/scripts/android/test.sh
deleted file mode 100755
index 342a187a0..000000000
--- a/scripts/android/test.sh
+++ /dev/null
@@ -1,13 +0,0 @@
-#!/usr/bin/env bash
-set -euo pipefail
-
-script_dir="$(cd "$(dirname "$0")" && pwd)"
-# shellcheck disable=SC1090
-. "$script_dir/../shared/common.sh"
-
-bash "$SCRIPTS_DIR/android/setup.sh"
-yarn install
-yarn e2e install
-yarn build
-yarn e2e build:android
-yarn e2e test:android
diff --git a/scripts/build.sh b/scripts/build.sh
deleted file mode 100755
index d22efb734..000000000
--- a/scripts/build.sh
+++ /dev/null
@@ -1,10 +0,0 @@
-#!/usr/bin/env bash
-set -euo pipefail
-
-script_dir="$(cd "$(dirname "$0")" && pwd)"
-# shellcheck disable=SC1090
-. "$script_dir/shared/common.sh"
-
-yarn install --immutable
-yarn build
-yarn lint
diff --git a/scripts/ios/env.sh b/scripts/ios/env.sh
deleted file mode 100755
index c5ee09930..000000000
--- a/scripts/ios/env.sh
+++ /dev/null
@@ -1,55 +0,0 @@
-#!/usr/bin/env bash
-set -euo pipefail
-
-devbox_omit_nix_env() {
-  if [ "${DEVBOX_OMIT_NIX_ENV_APPLIED:-}" = "1" ]; then
-    return 0
-  fi
-
-  export DEVBOX_OMIT_NIX_ENV_APPLIED=1
-
-  dump_env() {
-    echo "devbox omit-nix-env $1"
-    echo "  PATH=$PATH"
-    echo "  CC=${CC:-}"
-    echo "  CXX=${CXX:-}"
-    echo "  LD=${LD:-}"
-    echo "  CPP=${CPP:-}"
-    echo "  AR=${AR:-}"
-    echo "  SDKROOT=${SDKROOT:-}"
-    echo "  DEVELOPER_DIR=${DEVELOPER_DIR:-}"
-  }
-
-  dump_env "before"
-
-  eval "$(devbox shellenv --init-hook --install --no-refresh-alias --omit-nix-env=true)"
-
-  if [ "$(uname -s)" = "Darwin" ]; then
-    PATH="$(printf '%s' "$PATH" | tr ':' '\n' | awk '!/^\/nix\/store\//{print}' | paste -sd ':' -)"
-
-    for var in CC CXX LD CPP AR AS NM RANLIB STRIP OBJC OBJCXX SDKROOT DEVELOPER_DIR; do
-      value="${!var:-}"
-      if [ -n "$value" ] && [ "${value#/nix/store/}" != "$value" ]; then
-        unset "$var"
-      fi
-    done
-
-    if [ -x /usr/bin/clang ]; then
-      export CC=/usr/bin/clang
-      export CXX=/usr/bin/clang++
-    fi
-
-    if command -v xcode-select >/dev/null 2>&1; then
-      dev_dir="$(xcode-select -p 2>/dev/null || true)"
-      if [ -n "$dev_dir" ]; then
-        export DEVELOPER_DIR="$dev_dir"
-      fi
-    fi
-
-    unset SDKROOT
-  fi
-
-  dump_env "after"
-}
-
-devbox_omit_nix_env
diff --git a/scripts/ios/manager.sh b/scripts/ios/manager.sh
deleted file mode 100755
index 52359735f..000000000
--- a/scripts/ios/manager.sh
+++ /dev/null
@@ -1,51 +0,0 @@
-#!/usr/bin/env bash
-set -euo pipefail
-
-script_dir="$(cd "$(dirname "$0")" && pwd)"
-# shellcheck disable=SC1090
-. "$script_dir/../shared/common.sh"
-load_platform_versions "$script_dir"
-
-action="${1:-}"
-shift || true
-
-start_ios() {
-  local flavor="${IOS_FLAVOR:-latest}"
-  if [[ $flavor == "minsdk" ]]; then
-    export IOS_DEVICE_NAMES="${IOS_MIN_DEVICE:-${PLATFORM_IOS_MIN_DEVICE:-iPhone 13}}"
-    export IOS_RUNTIME="${IOS_MIN_RUNTIME:-${PLATFORM_IOS_MIN_RUNTIME:-15.0}}"
-    export DETOX_IOS_DEVICE="${DETOX_IOS_DEVICE:-${IOS_MIN_DEVICE:-${PLATFORM_IOS_MIN_DEVICE:-iPhone 13}}}"
-  else
-    export IOS_DEVICE_NAMES="${IOS_DEVICE_NAMES:-${IOS_MIN_DEVICE:-${PLATFORM_IOS_MIN_DEVICE:-iPhone 13}},${IOS_MAX_DEVICE:-${PLATFORM_IOS_MAX_DEVICE:-iPhone 17}}}"
-    export IOS_RUNTIME="${IOS_RUNTIME:-${IOS_MAX_RUNTIME:-${PLATFORM_IOS_MAX_RUNTIME:-}}}"
-    export DETOX_IOS_DEVICE="${DETOX_IOS_DEVICE:-iPhone 17}"
-  fi
-
-  devbox run setup-ios
-  local sim_device="${DETOX_IOS_DEVICE}"
-  if ! xcrun simctl list devices | grep -q "${sim_device}"; then
-    echo "Simulator ${sim_device} not found; ensure setup-ios created it." >&2
-    exit 1
-  fi
-  echo "Starting iOS simulator: ${sim_device} (runtime ${IOS_RUNTIME})"
-  xcrun simctl boot "$sim_device" || true
-  open -a Simulator
-}
-
-stop_ios() {
-  devbox run stop-ios
-}
-
-reset_ios() {
-  devbox run reset-ios
-}
-
-case "$action" in
-start) start_ios ;;
-stop) stop_ios ;;
-reset) reset_ios ;;
-*)
-  echo "Usage: manager.sh {start|stop|reset}" >&2
-  exit 1
-  ;;
-esac
diff --git a/scripts/ios/setup.sh b/scripts/ios/setup.sh
deleted file mode 100755
index de7827cad..000000000
--- a/scripts/ios/setup.sh
+++ /dev/null
@@ -1,69 +0,0 @@
-#!/usr/bin/env bash
-set -euo pipefail
-
-script_dir="$(cd "$(dirname "$0")" && pwd)"
-# shellcheck disable=SC1090
-. "$script_dir/../shared/common.sh"
-# shellcheck disable=SC1090
-. "$script_dir/simctl.sh"
-load_platform_versions "$script_dir"
-
-# Creates local iOS simulators for common targets. Requires Xcode command-line tools and jq.
-# Env overrides:
-#   IOS_DEVICE_NAMES="iPhone 15,iPhone 17" (comma-separated)
-#   IOS_RUNTIME="26.1" (preferred runtime prefix; falls back to latest available)
-#   IOS_DOWNLOAD_RUNTIME=1 to attempt xcodebuild -downloadPlatform iOS when the preferred runtime is missing
-#   IOS_DEVELOPER_DIR="/Applications/Xcode.app/Contents/Developer" to override the Xcode path; defaults to xcode-select -p or the standard Xcode.app if found
-
-ensure_developer_dir() {
-  local desired="${IOS_DEVELOPER_DIR:-}"
-  if [[ -z $desired ]]; then
-    if xcode-select -p >/dev/null 2>&1; then
-      desired="$(xcode-select -p)"
-    elif [[ -d /Applications/Xcode.app/Contents/Developer ]]; then
-      desired="/Applications/Xcode.app/Contents/Developer"
-    fi
-  fi
-
-  if [[ -n $desired && -d $desired ]]; then
-    export DEVELOPER_DIR="$desired"
-    export PATH="$DEVELOPER_DIR/usr/bin:$PATH"
-    return 0
-  fi
-
-  echo "Xcode developer directory not found. Install Xcode/CLI tools or set IOS_DEVELOPER_DIR to an Xcode path (e.g., /Applications/Xcode.app/Contents/Developer)." >&2
-  exit 1
-}
-
-ensure_developer_dir
-
-require_tool xcrun "Missing required tool: xcrun. Install Xcode CLI tools before running (xcode-select --install or Xcode.app + xcode-select -s)."
-require_tool jq
-
-ensure_simctl() {
-  if xcrun -f simctl >/dev/null 2>&1; then
-    return 0
-  fi
-  cat >&2 <<'EOF'
-Missing simctl.
-- The standalone Command Line Tools do NOT include simctl; you need full Xcode.
-- Install/locate Xcode.app, then select it:
-    sudo xcode-select -s /Applications/Xcode.app/Contents/Developer
-- You can also set IOS_DEVELOPER_DIR to your Xcode path for this script.
-EOF
-  exit 1
-}
-
-ensure_simctl
-
-main() {
-  ensure_core_sim_service || return 1
-  IFS=',' read -r -a devices <<<"${IOS_DEVICE_NAMES:-${IOS_MIN_DEVICE:-${PLATFORM_IOS_MIN_DEVICE:-iPhone 13}},${IOS_MAX_DEVICE:-${PLATFORM_IOS_MAX_DEVICE:-iPhone 17}}}"
-  local runtime="${IOS_RUNTIME:-${IOS_MIN_RUNTIME:-${PLATFORM_IOS_MIN_RUNTIME:-15.0}}}"
-  for device in "${devices[@]}"; do
-    ensure_device "$(echo "$device" | xargs)" "$runtime"
-  done
-  echo "Done. Launch via Xcode > Devices or 'xcrun simctl boot \"<name>\"' then 'open -a Simulator'."
-}
-
-main "$@"
diff --git a/scripts/ios/simctl.sh b/scripts/ios/simctl.sh
deleted file mode 100644
index ddfe7bf27..000000000
--- a/scripts/ios/simctl.sh
+++ /dev/null
@@ -1,127 +0,0 @@
-#!/usr/bin/env bash
-set -euo pipefail
-
-ensure_core_sim_service() {
-  local output status
-  output="$(xcrun simctl list devices -j 2>&1)" || status=$?
-  if [[ -n ${status:-} ]]; then
-    echo "simctl failed while listing devices (status ${status}). CoreSimulatorService may be unhealthy." >&2
-    echo "Try restarting it:" >&2
-    echo "  killall -9 com.apple.CoreSimulatorService 2>/dev/null || true" >&2
-    echo "  launchctl kickstart -k gui/$UID/com.apple.CoreSimulatorService" >&2
-    echo "Then open Simulator once and rerun devbox run setup-ios." >&2
-    echo "simctl error output:" >&2
-    echo "$output" >&2
-    return 1
-  fi
-
-  if echo "$output" | grep -q "CoreSimulatorService connection became invalid"; then
-    echo "CoreSimulatorService is not healthy. Try restarting it:" >&2
-    echo "  killall -9 com.apple.CoreSimulatorService 2>/dev/null || true" >&2
-    echo "  launchctl kickstart -k gui/$UID/com.apple.CoreSimulatorService" >&2
-    echo "Then open Simulator once and rerun devbox run setup-ios." >&2
-    echo "simctl error output:" >&2
-    echo "$output" >&2
-    return 1
-  fi
-}
-
-pick_runtime() {
-  local preferred="$1"
-  local json choice
-  json="$(xcrun simctl list runtimes -j)"
-  choice="$(echo "$json" | jq -r --arg v "$preferred" '.runtimes[] | select(.isAvailable and (.name|startswith("iOS \($v)"))) | "\(.identifier)|\(.name)"' | head -n1)"
-  if [[ -z $choice || $choice == "null" ]]; then
-    choice="$(echo "$json" | jq -r '.runtimes[] | select(.isAvailable and (.name|startswith("iOS "))) | "\(.version)|\(.identifier)|\(.name)"' | sort -Vr | head -n1 | cut -d"|" -f2-)"
-  fi
-  [[ -n $choice && $choice != "null" ]] || return 1
-  echo "$choice"
-}
-
-resolve_runtime() {
-  local preferred="$1"
-  if choice=$(pick_runtime "$preferred"); then
-    echo "$choice"
-    return 0
-  fi
-
-  if [[ ${IOS_DOWNLOAD_RUNTIME:-1} != "0" ]] && command -v xcodebuild >/dev/null 2>&1; then
-    echo "Preferred runtime iOS ${preferred} not found. Attempting to download via xcodebuild -downloadPlatform iOS..." >&2
-    if xcodebuild -downloadPlatform iOS; then
-      if choice=$(pick_runtime "$preferred"); then
-        echo "$choice"
-        return 0
-      fi
-    else
-      echo "xcodebuild -downloadPlatform iOS failed; continuing with available runtimes." >&2
-    fi
-  fi
-
-  pick_runtime "$preferred"
-}
-
-existing_device_udid_any_runtime() {
-  local name="$1"
-  xcrun simctl list devices -j | jq -r --arg name "$name" '.devices[]?[]? | select(.name == $name) | .udid' | head -n1
-}
-
-device_data_dir_exists() {
-  local udid="${1:-}"
-  [[ -n $udid ]] || return 1
-  local dir="$HOME/Library/Developer/CoreSimulator/Devices/$udid"
-  [[ -d $dir ]]
-}
-
-devicetype_id_for_name() {
-  local name="$1"
-  xcrun simctl list devicetypes -j | jq -r --arg name "$name" '.devicetypes[] | select((.name|ascii_downcase) == ($name|ascii_downcase)) | .identifier' | head -n1
-}
-
-ensure_device() {
-  local base_name="$1" preferred_runtime="$2"
-
-  # If a device with this name already exists anywhere, reuse it.
-  if
-    existing_udid=$(existing_device_udid_any_runtime "$base_name")
-    [[ -n ${existing_udid} ]]
-  then
-    if device_data_dir_exists "$existing_udid"; then
-      echo "Found existing ${base_name}: ${existing_udid}"
-      return 0
-    fi
-    echo "Existing ${base_name} (${existing_udid}) is missing its data directory. Deleting stale simulator..."
-    xcrun simctl delete "$existing_udid" || true
-  fi
-
-  local choice runtime_id runtime_name
-  if ! choice=$(resolve_runtime "$preferred_runtime"); then
-    echo "No available iOS simulator runtime found. Install one in Xcode (Settings > Platforms) and retry." >&2
-    return 1
-  fi
-  runtime_id="$(echo "$choice" | cut -d'|' -f1)"
-  runtime_name="$(echo "$choice" | cut -d'|' -f2)"
-
-  local display_name="${base_name} (${runtime_name})"
-
-  if ! device_type=$(devicetype_id_for_name "$base_name"); then
-    echo "Device type '${base_name}' is unavailable in this Xcode install. Skipping ${display_name}." >&2
-    return 0
-  fi
-
-  # Also check for an existing device with the runtime-qualified display name.
-  if
-    existing_udid=$(existing_device_udid_any_runtime "$display_name")
-    [[ -n ${existing_udid} ]]
-  then
-    if device_data_dir_exists "$existing_udid"; then
-      echo "Found existing ${display_name}: ${existing_udid}"
-      return 0
-    fi
-    echo "Existing ${display_name} (${existing_udid}) is missing its data directory. Deleting stale simulator..."
-    xcrun simctl delete "$existing_udid" || true
-  fi
-
-  echo "Creating ${display_name}..."
-  xcrun simctl create "$display_name" "$device_type" "$runtime_id"
-  echo "Created ${display_name}"
-}
diff --git a/scripts/ios/test.sh b/scripts/ios/test.sh
deleted file mode 100755
index 7bf5a4189..000000000
--- a/scripts/ios/test.sh
+++ /dev/null
@@ -1,25 +0,0 @@
-#!/usr/bin/env bash
-set -euo pipefail
-
-script_dir="$(cd "$(dirname "$0")" && pwd)"
-# shellcheck disable=SC1090
-. "$script_dir/../shared/common.sh"
-
-if [ "$(uname -s)" = "Darwin" ]; then
-  . "$SCRIPTS_DIR/ios/env.sh"
-fi
-
-echo "iOS test env"
-echo "  PATH=$PATH"
-echo "  CC=${CC:-}"
-echo "  CXX=${CXX:-}"
-echo "  SDKROOT=${SDKROOT:-}"
-echo "  DEVELOPER_DIR=${DEVELOPER_DIR:-}"
-
-bash "$SCRIPTS_DIR/ios/setup.sh"
-yarn install
-yarn e2e install
-yarn e2e pods
-yarn build
-yarn e2e build:ios
-yarn e2e test:ios
diff --git a/scripts/platform-versions.sh b/scripts/platform-versions.sh
deleted file mode 100644
index 0713ce9cb..000000000
--- a/scripts/platform-versions.sh
+++ /dev/null
@@ -1,12 +0,0 @@
-#!/usr/bin/env sh
-# Load shared platform version defaults from JSON for a single source of truth.
-
-script_dir="$(cd "$(dirname "$0")" && pwd)"
-repo_root="$(cd "$script_dir/.." && pwd)"
-versions_json="${PLATFORM_VERSIONS_JSON:-$repo_root/nix/platform-versions.json}"
-
-if [ -f "$versions_json" ] && command -v jq >/dev/null 2>&1; then
-  eval "$(
-    jq -r 'to_entries[] | "\(.key)=\(.value|@sh)"' "$versions_json"
-  )"
-fi
diff --git a/scripts/shared/common.sh b/scripts/shared/common.sh
deleted file mode 100644
index a62edbf02..000000000
--- a/scripts/shared/common.sh
+++ /dev/null
@@ -1,54 +0,0 @@
-#!/usr/bin/env sh
-
-require_tool() {
-  tool="$1"
-  message="${2:-Missing required tool: $tool. Ensure devbox shell is active and required packages are installed.}"
-  if ! command -v "$tool" >/dev/null 2>&1; then
-    echo "$message" >&2
-    exit 1
-  fi
-}
-
-ensure_project_root() {
-  if [ -n "${PROJECT_ROOT:-}" ]; then
-    return 0
-  fi
-
-  base_dir="${1:-}"
-  if [ -z "$base_dir" ]; then
-    base_dir="$PWD"
-  fi
-
-  git_root=""
-  if command -v git >/dev/null 2>&1; then
-    git_root="$(git -C "$base_dir" rev-parse --show-toplevel 2>/dev/null || true)"
-  fi
-
-  if [ -n "$git_root" ]; then
-    PROJECT_ROOT="$git_root"
-  elif [ -f "$base_dir/../shared/common.sh" ] && [ -f "$base_dir/../build.sh" ]; then
-    PROJECT_ROOT="$(cd "$base_dir/.." && pwd)"
-  elif [ -f "$base_dir/shared/common.sh" ] && [ -f "$base_dir/build.sh" ]; then
-    PROJECT_ROOT="$(cd "$base_dir" && pwd)"
-  fi
-
-  if [ -n "${PROJECT_ROOT:-}" ]; then
-    export PROJECT_ROOT
-  fi
-}
-
-load_platform_versions() {
-  base_dir="$1"
-  platform_versions="${base_dir%/}/../platform-versions.sh"
-  if [ -f "$platform_versions" ]; then
-    # shellcheck disable=SC1090
-    . "$platform_versions"
-  fi
-}
-
-ensure_project_root "${SCRIPT_DIR:-${script_dir:-${PWD}}}"
-
-if [ -z "${SCRIPTS_DIR:-}" ] && [ -n "${PROJECT_ROOT:-}" ]; then
-  SCRIPTS_DIR="$PROJECT_ROOT/scripts"
-  export SCRIPTS_DIR
-fi
diff --git a/scripts/sync-versions.sh b/scripts/sync-versions.sh
index 51f911283..8dba3e19a 100755
--- a/scripts/sync-versions.sh
+++ b/scripts/sync-versions.sh
@@ -2,12 +2,23 @@
 set -euo pipefail
 
 # Syncs package.json version fields with the latest published npm versions.
-# Run via: devbox run sync-versions
+#
+# Usage:
+#   devbox run sync-versions              # update version fields in place
+#   devbox run sync-versions-check        # check only, fail if out of sync
+#
+# If the CI check fails, run `devbox run sync-versions` locally and commit.
+
+CHECK_ONLY=false
+if [ "${1:-}" = "--check" ]; then
+  CHECK_ONLY=true
+fi
 
 PROJECT_ROOT="${PROJECT_ROOT:-$(git rev-parse --show-toplevel)}"
 
 updated=0
 skipped=0
+drift=0
 
 for pkg_json in "$PROJECT_ROOT"/packages/*/package.json "$PROJECT_ROOT"/packages/plugins/*/package.json; do
   [ -f "$pkg_json" ] || continue
@@ -32,12 +43,24 @@ for pkg_json in "$PROJECT_ROOT"/packages/*/package.json "$PROJECT_ROOT"/packages
   if [ "$current" = "$latest" ]; then
     echo "  ok   $name@$current"
     skipped=$((skipped + 1))
+  elif [ "$CHECK_ONLY" = true ]; then
+    echo "  drift $name $current (local) != $latest (npm)"
+    drift=$((drift + 1))
   else
-    jq --arg v "$latest" '.version = $v' "$pkg_json" > "$pkg_json.tmp" && mv "$pkg_json.tmp" "$pkg_json"
+    jq --arg v "$latest" '.version = $v' "$pkg_json" >"$pkg_json.tmp" && mv "$pkg_json.tmp" "$pkg_json"
     echo "  bump $name $current -> $latest"
     updated=$((updated + 1))
   fi
 done
 
 echo ""
-echo "Done: $updated updated, $skipped unchanged/skipped"
+if [ "$CHECK_ONLY" = true ]; then
+  if [ "$drift" -gt 0 ]; then
+    echo "Error: $drift package(s) out of sync with npm."
+    echo "Run 'devbox run sync-versions' locally and commit the result."
+    exit 1
+  fi
+  echo "All $skipped package(s) in sync with npm."
+else
+  echo "Done: $updated updated, $skipped unchanged/skipped"
+fi
diff --git a/shells/devbox-android.json b/shells/devbox-android.json
deleted file mode 100644
index a1be49c55..000000000
--- a/shells/devbox-android.json
+++ /dev/null
@@ -1,21 +0,0 @@
-{
-  "$schema": "https://raw.githubusercontent.com/jetify-com/devbox/0.14.2/.schema/devbox.schema.json",
-  "packages": {
-    "yarn-berry": "latest",
-    "jdk17": "latest",
-    "gradle": "latest",
-    "jq": "latest",
-    "path:../nix#android-sdk": ""
-  },
-  "shell": {
-    "init_hook": [
-      ". $DEVBOX_PROJECT_ROOT/../scripts/shared/common.sh",
-      "echo 'Android SDK env configured (details: wiki/devbox.md#devbox-android).'",
-      ". $SCRIPTS_DIR/android/env.sh"
-    ],
-    "scripts": {
-      "setup-android": ["bash $SCRIPTS_DIR/android/setup.sh"],
-      "test-android": ["bash $SCRIPTS_DIR/android/test.sh"]
-    }
-  }
-}
diff --git a/shells/devbox-fast.json b/shells/devbox-fast.json
deleted file mode 100644
index 59aaccc83..000000000
--- a/shells/devbox-fast.json
+++ /dev/null
@@ -1,36 +0,0 @@
-{
-  "$schema": "https://raw.githubusercontent.com/jetify-com/devbox/0.14.2/.schema/devbox.schema.json",
-  "packages": {
-    "yarn-berry": "latest",
-    "jq": "latest",
-    "treefmt": "latest",
-    "nixfmt": "latest",
-    "shfmt": "latest"
-  },
-  "shell": {
-    "init_hook": [". $DEVBOX_PROJECT_ROOT/../scripts/shared/common.sh"],
-    "scripts": {
-      "build": ["bash $SCRIPTS_DIR/build.sh"],
-      "release": [
-        "cd \"$PROJECT_ROOT\"",
-        "yarn install --immutable",
-        "yarn build",
-        "yarn multi-semantic-release"
-      ],
-      "release-dry-run": [
-        "cd \"$PROJECT_ROOT\"",
-        "yarn install --immutable",
-        "yarn build",
-        "yarn multi-semantic-release --dry-run"
-      ],
-      "format": ["treefmt"],
-      "lint": ["treefmt --fail-on-change"],
-      "sync-versions": ["bash $SCRIPTS_DIR/sync-versions.sh"],
-      "update-apps": [
-        "yarn install --no-immutable",
-        "yarn e2e install --no-immutable",
-        "yarn example install --no-immutable"
-      ]
-    }
-  }
-}
diff --git a/shells/devbox-ios.json b/shells/devbox-ios.json
deleted file mode 100644
index ba43b7d33..000000000
--- a/shells/devbox-ios.json
+++ /dev/null
@@ -1,21 +0,0 @@
-{
-  "$schema": "https://raw.githubusercontent.com/jetify-com/devbox/0.14.2/.schema/devbox.schema.json",
-  "packages": {
-    "cocoapods": {
-      "version": "latest",
-      "platforms": ["x86_64-darwin", "aarch64-darwin"]
-    },
-    "yarn-berry": "latest",
-    "jq": "latest"
-  },
-  "shell": {
-    "init_hook": [
-      ". $DEVBOX_PROJECT_ROOT/../scripts/shared/common.sh",
-      "if [ \"$(uname -s)\" = \"Darwin\" ]; then . $SCRIPTS_DIR/ios/env.sh; fi"
-    ],
-    "scripts": {
-      "setup-ios": ["bash $SCRIPTS_DIR/ios/setup.sh"],
-      "test-ios": ["bash $SCRIPTS_DIR/ios/test.sh"]
-    }
-  }
-}
diff --git a/shells/devbox.lock b/shells/devbox.lock
deleted file mode 100644
index e652c6018..000000000
--- a/shells/devbox.lock
+++ /dev/null
@@ -1,317 +0,0 @@
-{
-  "lockfile_version": "1",
-  "packages": {
-    "github:NixOS/nixpkgs/nixpkgs-unstable": {
-      "last_modified": "2026-01-27T15:18:14Z",
-      "resolved": "github:NixOS/nixpkgs/afce96367b2e37fc29afb5543573cd49db3357b7?lastModified=1769527094"
-    },
-    "jq@latest": {
-      "last_modified": "2026-01-20T02:11:35Z",
-      "resolved": "github:NixOS/nixpkgs/ed142ab1b3a092c4d149245d0c4126a5d7ea00b0#jq",
-      "source": "devbox-search",
-      "version": "1.8.1",
-      "systems": {
-        "aarch64-darwin": {
-          "outputs": [
-            {
-              "name": "bin",
-              "path": "/nix/store/9rm6fm3zq1jq8rgsx528cw8wkmfya2gf-jq-1.8.1-bin",
-              "default": true
-            },
-            {
-              "name": "man",
-              "path": "/nix/store/cv999saj62xhq7xv5i7q6944vljykfmw-jq-1.8.1-man",
-              "default": true
-            },
-            {
-              "name": "dev",
-              "path": "/nix/store/5camppj4hz2mgkdbxs0kr6nvh6qa65wf-jq-1.8.1-dev"
-            },
-            {
-              "name": "doc",
-              "path": "/nix/store/lak094rhhxlaj1qycadmxyfphgjadj5r-jq-1.8.1-doc"
-            },
-            {
-              "name": "out",
-              "path": "/nix/store/g371yvjasdr552v98p5kav7n35s1dfib-jq-1.8.1"
-            }
-          ],
-          "store_path": "/nix/store/9rm6fm3zq1jq8rgsx528cw8wkmfya2gf-jq-1.8.1-bin"
-        },
-        "aarch64-linux": {
-          "outputs": [
-            {
-              "name": "bin",
-              "path": "/nix/store/m8qv4g54q3jmjb8i33v9lljcwhydx2vd-jq-1.8.1-bin",
-              "default": true
-            },
-            {
-              "name": "man",
-              "path": "/nix/store/9x2457g76jikfy7xq4mjqwzl8iz3zvxj-jq-1.8.1-man",
-              "default": true
-            },
-            {
-              "name": "dev",
-              "path": "/nix/store/5ykn83b3hhvnnq0p5vqgcrzihrl9wpsl-jq-1.8.1-dev"
-            },
-            {
-              "name": "doc",
-              "path": "/nix/store/37ypy1595g6rj3cymh1mpk2b25fx40g7-jq-1.8.1-doc"
-            },
-            {
-              "name": "out",
-              "path": "/nix/store/16lg603jzppwjanlakcak1ais69mkd03-jq-1.8.1"
-            }
-          ],
-          "store_path": "/nix/store/m8qv4g54q3jmjb8i33v9lljcwhydx2vd-jq-1.8.1-bin"
-        },
-        "x86_64-darwin": {
-          "outputs": [
-            {
-              "name": "bin",
-              "path": "/nix/store/kkb17whpkdrmn9g3gk7y6l69vipxsw0i-jq-1.8.1-bin",
-              "default": true
-            },
-            {
-              "name": "man",
-              "path": "/nix/store/iwr61wi83kflqvz8j5nf7ridaqq6nh2w-jq-1.8.1-man",
-              "default": true
-            },
-            {
-              "name": "dev",
-              "path": "/nix/store/lypnqs272644l8ff6wfji9rg5jw10v7h-jq-1.8.1-dev"
-            },
-            {
-              "name": "doc",
-              "path": "/nix/store/nyw97c4pywfcqqap5hyk9xjghczlbshl-jq-1.8.1-doc"
-            },
-            {
-              "name": "out",
-              "path": "/nix/store/ri930a557685c64bdh88a5031i7hx3vy-jq-1.8.1"
-            }
-          ],
-          "store_path": "/nix/store/kkb17whpkdrmn9g3gk7y6l69vipxsw0i-jq-1.8.1-bin"
-        },
-        "x86_64-linux": {
-          "outputs": [
-            {
-              "name": "bin",
-              "path": "/nix/store/zssasryipb2x4gk2ahzacl4mvvcmk48j-jq-1.8.1-bin",
-              "default": true
-            },
-            {
-              "name": "man",
-              "path": "/nix/store/7d4pv1iymyqk2lykwj1ydml3rjhc6gl3-jq-1.8.1-man",
-              "default": true
-            },
-            {
-              "name": "dev",
-              "path": "/nix/store/rmxxm5jnxq93kvkhbr2b3hzj6v3ldp8z-jq-1.8.1-dev"
-            },
-            {
-              "name": "doc",
-              "path": "/nix/store/mkhfvc69grlky3iblibkw9wcc12jcdqq-jq-1.8.1-doc"
-            },
-            {
-              "name": "out",
-              "path": "/nix/store/807g765zgpmp1c8fm5y40rw2gbr1k6dk-jq-1.8.1"
-            }
-          ],
-          "store_path": "/nix/store/zssasryipb2x4gk2ahzacl4mvvcmk48j-jq-1.8.1-bin"
-        }
-      }
-    },
-    "nixfmt@latest": {
-      "last_modified": "2026-02-23T15:40:43Z",
-      "resolved": "github:NixOS/nixpkgs/80d901ec0377e19ac3f7bb8c035201e2e098cc97#nixfmt",
-      "source": "devbox-search",
-      "version": "1.2.0",
-      "systems": {
-        "aarch64-darwin": {
-          "outputs": [
-            {
-              "name": "out",
-              "path": "/nix/store/igl44md7ljf5c3hx6s6ys6325fkpldny-nixfmt-1.2.0",
-              "default": true
-            }
-          ],
-          "store_path": "/nix/store/igl44md7ljf5c3hx6s6ys6325fkpldny-nixfmt-1.2.0"
-        },
-        "aarch64-linux": {
-          "outputs": [
-            {
-              "name": "out",
-              "path": "/nix/store/s250gfxr6v1bmxdx9l8z4sn5fjf2bllb-nixfmt-1.2.0",
-              "default": true
-            }
-          ],
-          "store_path": "/nix/store/s250gfxr6v1bmxdx9l8z4sn5fjf2bllb-nixfmt-1.2.0"
-        },
-        "x86_64-darwin": {
-          "outputs": [
-            {
-              "name": "out",
-              "path": "/nix/store/jb1qw3g5hcslahl02v7mjaixwfw725g8-nixfmt-1.2.0",
-              "default": true
-            }
-          ],
-          "store_path": "/nix/store/jb1qw3g5hcslahl02v7mjaixwfw725g8-nixfmt-1.2.0"
-        },
-        "x86_64-linux": {
-          "outputs": [
-            {
-              "name": "out",
-              "path": "/nix/store/ihzhi2cgjfhvqbap36fx91hbj524ym5l-nixfmt-1.2.0",
-              "default": true
-            }
-          ],
-          "store_path": "/nix/store/ihzhi2cgjfhvqbap36fx91hbj524ym5l-nixfmt-1.2.0"
-        }
-      }
-    },
-    "shfmt@latest": {
-      "last_modified": "2026-02-23T15:40:43Z",
-      "resolved": "github:NixOS/nixpkgs/80d901ec0377e19ac3f7bb8c035201e2e098cc97#shfmt",
-      "source": "devbox-search",
-      "version": "3.12.0",
-      "systems": {
-        "aarch64-darwin": {
-          "outputs": [
-            {
-              "name": "out",
-              "path": "/nix/store/sc8kb91395fw69qcmij89m3bxdmj8gwb-shfmt-3.12.0",
-              "default": true
-            }
-          ],
-          "store_path": "/nix/store/sc8kb91395fw69qcmij89m3bxdmj8gwb-shfmt-3.12.0"
-        },
-        "aarch64-linux": {
-          "outputs": [
-            {
-              "name": "out",
-              "path": "/nix/store/a80kl3brskqmq8k861x8hjwnlw94kyfn-shfmt-3.12.0",
-              "default": true
-            }
-          ],
-          "store_path": "/nix/store/a80kl3brskqmq8k861x8hjwnlw94kyfn-shfmt-3.12.0"
-        },
-        "x86_64-darwin": {
-          "outputs": [
-            {
-              "name": "out",
-              "path": "/nix/store/hax40r2y50jv8z0rlryfc11gvnhfx7hz-shfmt-3.12.0",
-              "default": true
-            }
-          ],
-          "store_path": "/nix/store/hax40r2y50jv8z0rlryfc11gvnhfx7hz-shfmt-3.12.0"
-        },
-        "x86_64-linux": {
-          "outputs": [
-            {
-              "name": "out",
-              "path": "/nix/store/822axjnnxnscgxwval6lrc1bp5q4n9li-shfmt-3.12.0",
-              "default": true
-            }
-          ],
-          "store_path": "/nix/store/822axjnnxnscgxwval6lrc1bp5q4n9li-shfmt-3.12.0"
-        }
-      }
-    },
-    "treefmt@latest": {
-      "last_modified": "2026-02-23T15:40:43Z",
-      "resolved": "github:NixOS/nixpkgs/80d901ec0377e19ac3f7bb8c035201e2e098cc97#treefmt",
-      "source": "devbox-search",
-      "version": "2.4.0",
-      "systems": {
-        "aarch64-darwin": {
-          "outputs": [
-            {
-              "name": "out",
-              "path": "/nix/store/gza41a4j5hypl5vl6f7x5s0xgnx0g06h-treefmt-2.4.0",
-              "default": true
-            }
-          ],
-          "store_path": "/nix/store/gza41a4j5hypl5vl6f7x5s0xgnx0g06h-treefmt-2.4.0"
-        },
-        "aarch64-linux": {
-          "outputs": [
-            {
-              "name": "out",
-              "path": "/nix/store/rz6d1w4a8gkkrd9gk4nfadskzyz75h4v-treefmt-2.4.0",
-              "default": true
-            }
-          ],
-          "store_path": "/nix/store/rz6d1w4a8gkkrd9gk4nfadskzyz75h4v-treefmt-2.4.0"
-        },
-        "x86_64-darwin": {
-          "outputs": [
-            {
-              "name": "out",
-              "path": "/nix/store/h7xb3dssb16yny6wg713w78lawivzjay-treefmt-2.4.0",
-              "default": true
-            }
-          ],
-          "store_path": "/nix/store/h7xb3dssb16yny6wg713w78lawivzjay-treefmt-2.4.0"
-        },
-        "x86_64-linux": {
-          "outputs": [
-            {
-              "name": "out",
-              "path": "/nix/store/vp95nd69hq59rqpdlgrg63wncy4yw8fd-treefmt-2.4.0",
-              "default": true
-            }
-          ],
-          "store_path": "/nix/store/vp95nd69hq59rqpdlgrg63wncy4yw8fd-treefmt-2.4.0"
-        }
-      }
-    },
-    "yarn-berry@latest": {
-      "last_modified": "2025-12-31T03:27:36Z",
-      "resolved": "github:NixOS/nixpkgs/f665af0cdb70ed27e1bd8f9fdfecaf451260fc55#yarn-berry",
-      "source": "devbox-search",
-      "version": "4.12.0",
-      "systems": {
-        "aarch64-darwin": {
-          "outputs": [
-            {
-              "name": "out",
-              "path": "/nix/store/2l7sbyyqardvrzr35zkrw67gbng5gb8y-yarn-berry-4.12.0",
-              "default": true
-            }
-          ],
-          "store_path": "/nix/store/2l7sbyyqardvrzr35zkrw67gbng5gb8y-yarn-berry-4.12.0"
-        },
-        "aarch64-linux": {
-          "outputs": [
-            {
-              "name": "out",
-              "path": "/nix/store/klx9ndw1djgx0zhhyrkcn9an094rmmwv-yarn-berry-4.12.0",
-              "default": true
-            }
-          ],
-          "store_path": "/nix/store/klx9ndw1djgx0zhhyrkcn9an094rmmwv-yarn-berry-4.12.0"
-        },
-        "x86_64-darwin": {
-          "outputs": [
-            {
-              "name": "out",
-              "path": "/nix/store/m6cwiya6hrbwnlprh2cbnmz6c7mkylrf-yarn-berry-4.12.0",
-              "default": true
-            }
-          ],
-          "store_path": "/nix/store/m6cwiya6hrbwnlprh2cbnmz6c7mkylrf-yarn-berry-4.12.0"
-        },
-        "x86_64-linux": {
-          "outputs": [
-            {
-              "name": "out",
-              "path": "/nix/store/q1gys3zgijcciiafbh9nfawkx5wj8179-yarn-berry-4.12.0",
-              "default": true
-            }
-          ],
-          "store_path": "/nix/store/q1gys3zgijcciiafbh9nfawkx5wj8179-yarn-berry-4.12.0"
-        }
-      }
-    }
-  }
-}
diff --git a/shells/gradle.properties b/shells/gradle.properties
deleted file mode 100644
index a468eda9e..000000000
--- a/shells/gradle.properties
+++ /dev/null
@@ -1 +0,0 @@
-org.gradle.java.home=/nix/store/hlm8a8cnp4hm8xkg0a2yy4kv7cq44jii-zulu-ca-jdk-17.0.12