Add Gematria mode 10 (v1.3.0)

Port gematria logic from gematria.py: Hebrew/Arabic/English letter
values with --lang flag (hebrew|arabic|english|all). Added to both
bin/zitsbit and distributed zitsbit.js. Version bumped to 1.3.0.

Co-authored-by: CommandCodeBot <noreply@commandcode.ai>

install.sh

@@ -0,0 +1,44 @@
+#!/bin/sh
+set -e
+
+BIN_DIR="${HOME}/bin"
+SCRIPT_URL="https://app.z8tek.net/zitsbit/zitsbit.js"
+TARGET="${BIN_DIR}/zitsbit"
+
+echo ">>> Installing zitsbit..."
+
+# Ensure ~/bin exists
+mkdir -p "${BIN_DIR}"
+
+# Download the script
+echo ">>> Downloading from ${SCRIPT_URL}..."
+if command -v curl >/dev/null 2>&1; then
+  curl -sfL "${SCRIPT_URL}" -o "${TARGET}"
+elif command -v wget >/dev/null 2>&1; then
+  wget -q "${SCRIPT_URL}" -O "${TARGET}"
+else
+  echo "ERROR: Need curl or wget to install." >&2
+  exit 1
+fi
+
+chmod +x "${TARGET}"
+
+# Add ~/bin to PATH if not already there
+case ":${PATH}:" in
+  *:"${BIN_DIR}":*) ;;
+  *)
+    SHELL_PROFILE="${HOME}/.profile"
+    if [ -n "${ZSH_VERSION}" ]; then SHELL_PROFILE="${HOME}/.zshrc"; fi
+    if [ -n "${BASH_VERSION}" ]; then
+      [ -f "${HOME}/.bashrc" ] && SHELL_PROFILE="${HOME}/.bashrc"
+    fi
+    echo "export PATH=\"\${PATH}:${BIN_DIR}\"" >> "${SHELL_PROFILE}"
+    echo ">>> Added ${BIN_DIR} to PATH in ${SHELL_PROFILE}"
+    echo ">>> Run: source ${SHELL_PROFILE}"
+    ;;
+esac
+
+echo ""
+echo "  zitsbit installed to ${TARGET}"
+echo "  Run: zitsbit --help"
+echo ""