fix: resolve 17 confirmed bash-parity drifts from port review

Adversarial parity review of every ported action against its bash source
confirmed 17 real behavioral drifts (of 22 claimed); all fixed here:

- tiers/chown: defaults were compositions/apex/tierN (one level too deep);
  now the tier roots. shared/ base reset is non-recursive again.
- compose: --dry-run was swallowed by argparse.REMAINDER; now stripped.
- host.write_file: rendered files land 0644 (tempfile's 0600 made fresh
  systemd units/crowdsec configs owner-only).
- systemd.deploy_units: top-level non-hidden files only.
- ufw: missing docker/host config dir exits 66; missing /etc/ufw target
  aborts; empty rules dir warns; dotfile .rules excluded.
- sync/packages: Telegram error-trap parity and failed notify exits 1.
  Same notify-failure exit for backup/run and sync/repository.
  repository regains the node-dir guard.
- tiers/useradd: no more secret-bearing .env.bak per run.
- tiers/link: EOF on confirm prompt declines and continues.
- extract-traefik-certs: sudo mkdir inside the notify envelope.
- generate-happ-subscriptions: realpath parent-exists guards + docker check.
- configure/crowdsec: bouncer install goes through install_packages.
- lint-docker-compose: malformed/unreadable anchor-IP inputs are lint errors.
- core compose: APEX_RESTIC_REPOSITORY now ?error; RESTIC_COMPRESSION
  per-node via APEX_RESTIC_COMPRESSION (default auto).
- sys.service_exists line-anchored; tpl docstring corrected.

actions/sync/repository.py

@@ -23,6 +23,11 @@ def run(ctx, args):
         if (cp.stdout or "").strip():
             log.error(f"Commons submodule at {commons} has uncommitted changes. Aborting.")
             raise SystemExit(1)
+        if not os.path.isdir(ctx.paths.compositions):
+            # Without this, `git add -A` would stage a deleted node tree and an
+            # unattended cron run would commit + force-push the deletion.
+            log.error(f"Directory '{ctx.paths.compositions}' does not exist. Cannot sync.")
+            raise SystemExit(1)
         branch = f"sync/{node}"
         ts = datetime.now().strftime("%Y-%m-%d %H:%M:%S")
         if ctx.sys.ok(["git", "-C", repo, "rev-parse", "--verify", branch]):
@@ -45,7 +50,8 @@ def run(ctx, args):
         git("submodule", "update", "--init", "--recursive")
         git("push", "--force-with-lease", "origin", branch)
         log.success(f"Pushed {branch}.")
-        ctx.notify.success(TITLE, url, f"Sync to '{branch}' completed.", node)
+        if not ctx.notify.success(TITLE, url, f"Sync to '{branch}' completed.", node):
+            raise SystemExit(1)
     except SystemExit:
         raise
     except Exception as e: