add new deploy script and cutting out pip as the installer

scripts/deploy

@@ -0,0 +1,97 @@
+#!/bin/sh
+# Deploy pobsync runtime into /opt/pobsync without pip/venv.
+# Copies python package sources into /opt/pobsync/lib and installs a stable entrypoint in /opt/pobsync/bin.
+
+set -eu
+
+PREFIX="/opt/pobsync"
+
+usage() {
+  echo "Usage: $0 [--prefix /opt/pobsync]" >&2
+  exit 2
+}
+
+while [ $# -gt 0 ]; do
+  case "$1" in
+    --prefix)
+      [ $# -ge 2 ] || usage
+      PREFIX="$2"
+      shift 2
+      ;;
+    -h|--help)
+      usage
+      ;;
+    *)
+      echo "Unknown arg: $1" >&2
+      usage
+      ;;
+  esac
+done
+
+# Determine repo root from this script location
+SCRIPT_DIR="$(CDPATH= cd -- "$(dirname -- "$0")" && pwd)"
+REPO_ROOT="$(CDPATH= cd -- "${SCRIPT_DIR}/.." && pwd)"
+
+SRC_PKG="${REPO_ROOT}/src/pobsync"
+if [ ! -d "${SRC_PKG}" ]; then
+  echo "ERROR: expected python package at ${SRC_PKG}" >&2
+  exit 1
+fi
+
+BIN_DIR="${PREFIX}/bin"
+LIB_DIR="${PREFIX}/lib"
+DST_PKG="${LIB_DIR}/pobsync"
+BUILD_FILE="${DST_PKG}/_build.txt"
+
+mkdir -p "${BIN_DIR}" "${LIB_DIR}"
+
+# Copy code into /opt/pobsync/lib/pobsync
+# We use rsync if available (clean updates with --delete), otherwise fall back to cp -a.
+if command -v rsync >/dev/null 2>&1; then
+  rsync -a --delete \
+    --exclude '__pycache__/' \
+    --exclude '*.pyc' \
+    --exclude '*.pyo' \
+    --exclude '*.pyd' \
+    "${SRC_PKG}/" "${DST_PKG}/"
+else
+  # Fallback: wipe + copy
+  rm -rf "${DST_PKG}"
+  mkdir -p "${DST_PKG}"
+  cp -a "${SRC_PKG}/." "${DST_PKG}/"
+fi
+
+# Write build info (best-effort)
+GIT_SHA="unknown"
+if command -v git >/dev/null 2>&1 && [ -d "${REPO_ROOT}/.git" ]; then
+  GIT_SHA="$(cd "${REPO_ROOT}" && git rev-parse HEAD 2>/dev/null || echo unknown)"
+fi
+
+NOW_UTC="$(date -u +"%Y-%m-%dT%H:%M:%SZ" 2>/dev/null || echo unknown)"
+{
+  echo "deployed_at_utc=${NOW_UTC}"
+  echo "git_sha=${GIT_SHA}"
+  echo "repo_root=${REPO_ROOT}"
+} > "${BUILD_FILE}"
+
+# Install stable entrypoint that always runs code from /opt/pobsync/lib
+WRAPPER="${BIN_DIR}/pobsync"
+cat > "${WRAPPER}" <<EOF
+#!/bin/sh
+# managed-by=pobsync deploy
+set -eu
+
+PREFIX="${PREFIX}"
+export PYTHONPATH="\${PREFIX}/lib"
+export PYTHONUNBUFFERED=1
+
+exec /usr/bin/python3 -m pobsync "\$@"
+EOF
+
+chmod 0755 "${WRAPPER}"
+
+echo "OK"
+echo "- deployed package to ${DST_PKG}"
+echo "- wrote build info ${BUILD_FILE}"
+echo "- installed entrypoint ${WRAPPER}"
+