Prepare v0.4 release and open source docs

scripts/verify-release-size.sh

@@ -0,0 +1,40 @@
+#!/usr/bin/env bash
+set -euo pipefail
+
+ROOT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")/.." && pwd)"
+source "$ROOT_DIR/scripts/release-version.sh"
+
+DIST_DIR="${DIST_DIR:-$ROOT_DIR/dist}"
+PER_ARCH_INSTALLER_MAX_BYTES="${PER_ARCH_INSTALLER_MAX_BYTES:-400000}"
+PER_ARCH_INSTALLER_EXTENSION="${PER_ARCH_INSTALLER_EXTENSION:-tar.xz}"
+
+fail() {
+  echo "release size verification failed: $*" >&2
+  exit 1
+}
+
+file_size() {
+  stat -f '%z' "$1"
+}
+
+verify_under_budget() {
+  local path="$1"
+  [[ -f "$path" ]] || fail "missing $path"
+
+  local bytes
+  bytes="$(file_size "$path")"
+  if (( bytes >= PER_ARCH_INSTALLER_MAX_BYTES )); then
+    fail "$path is $bytes bytes; per-architecture installer budget is < $PER_ARCH_INSTALLER_MAX_BYTES bytes"
+  fi
+
+  echo "OK: $path is $bytes bytes (< $PER_ARCH_INSTALLER_MAX_BYTES)."
+}
+
+if (( $# > 0 )); then
+  for artifact in "$@"; do
+    verify_under_budget "$artifact"
+  done
+else
+  verify_under_budget "$DIST_DIR/IHatePDFs-v$RELEASE_VERSION-macos-arm64.$PER_ARCH_INSTALLER_EXTENSION"
+  verify_under_budget "$DIST_DIR/IHatePDFs-v$RELEASE_VERSION-macos-x86_64.$PER_ARCH_INSTALLER_EXTENSION"
+fi