fix(release): preserve failed installer retry status

Cover all retry call sites with isolated regressions in focused checks and installer CI. Add EN/DE operating guidance and record the unreleased Xrechnung and installer audit follow-ups without changing immutable release artifacts.

Refs #54

tools/checks/check-focused.sh

@@ -50,7 +50,7 @@ cd "$META_ROOT"
 "$PYTHON" tools/checks/check-webui-package-facades.py
 "$PYTHON" -m unittest tests.test_webui_package_facades
 "$PYTHON" -m unittest tests.test_module_package_workflows tests.test_package_registry_release
-"$PYTHON" -m unittest tests.test_deployment_installer
+"$PYTHON" -m unittest tests.test_deployment_installer tests.test_webui_release_dependency_retries
 "$PYTHON" -m unittest tests.test_capability_fit_evidence
 "$PYTHON" -m unittest tests.test_capability_fit_generation tests.test_capability_fit_review
 "$PYTHON" tools/assessments/generate-capability-fit-report.py --check

tools/release/install-webui-release-dependencies.sh

@@ -19,8 +19,9 @@ retry() {
   for attempt in 1 2 3; do
     if "$@"; then
       return 0
+    else
+      status=$?
     fi
-    status=$?
     if [[ "$attempt" == 3 ]]; then
       return "$status"
     fi