Fix PR review comments: version check, runtime deps, CI test deps, release guard

- install.sh: Replace awk float comparison with integer major/minor check
  so Python 3.9 is correctly rejected as < 3.13
- nfpm.yaml: Add git/curl/wget as recommends so users have basic archiving
  tools out of the box without needing `archivebox install`
- debian.yml: Restore git/curl/wget in CI smoke test to match what the
  package recommends, instead of relying on runner preinstalls
- debian.yml: Guard release upload to skip gracefully when no GitHub
  Release exists (fixes workflow_dispatch failures)

https://claude.ai/code/session_01Vx1EsNrNySgsc8Y67dGzCn

pkg/debian/install.sh

@@ -13,8 +13,10 @@ if command -v python3.13 >/dev/null 2>&1; then
     PYTHON="python3.13"
 elif command -v python3 >/dev/null 2>&1; then
     PYTHON="python3"
-    PY_VER="$("$PYTHON" -c 'import sys; print(f"{sys.version_info.major}.{sys.version_info.minor}")')"
-    if [ "$(echo "$PY_VER 3.13" | awk '{print ($1 >= $2)}')" != "1" ]; then
+    PY_MAJOR="$("$PYTHON" -c 'import sys; print(sys.version_info.major)')"
+    PY_MINOR="$("$PYTHON" -c 'import sys; print(sys.version_info.minor)')"
+    if [ "$PY_MAJOR" -lt 3 ] || { [ "$PY_MAJOR" -eq 3 ] && [ "$PY_MINOR" -lt 13 ]; }; then
+        PY_VER="${PY_MAJOR}.${PY_MINOR}"
         echo "[!] Error: ArchiveBox requires Python >= 3.13, but found Python $PY_VER"
         echo "    Install python3.13: sudo apt install python3.13 python3.13-venv"
         exit 1

pkg/debian/nfpm.yaml

@@ -28,6 +28,14 @@ depends:
   # All other runtime deps (node, chrome, yt-dlp, etc.) are installed on-demand
   # by `archivebox install` and should NOT be declared as package dependencies.
 
+recommends:
+  # Common utilities used by archivebox extractors. Declared as recommends
+  # (not depends) so dpkg doesn't hard-fail if they're missing, but apt
+  # installs them by default so users have a working baseline out of the box.
+  - git
+  - curl
+  - wget
+
 contents:
   # Wrapper script for /usr/bin/archivebox
   - src: pkg/debian/archivebox