diff --git a/.github/workflows/shell-tests.yml b/.github/workflows/shell-tests.yml
index ea5eccc..a949d38 100644
--- a/.github/workflows/shell-tests.yml
+++ b/.github/workflows/shell-tests.yml
@@ -55,7 +55,14 @@ jobs:
         run: find . -type f -name '*.sh' -print0 | xargs -0 -n1 bash -n
 
       - name: Run ShellCheck
-        run: git ls-files -z -- '*.sh' | xargs -0 -r shellcheck -x --severity=error --
+        shell: bash
+        run: |
+          # All tracked Bash scripts outside tests are production by default.
+          # Check both groups even when production lint fails.
+          status=0
+          git ls-files -z -- "*.sh" ":!:tests/**" | xargs -0 -r shellcheck -x --severity=warning -- || status=1
+          git ls-files -z -- "tests/*.sh" | xargs -0 -r shellcheck -x --severity=error -- || status=1
+          exit "$status"
 
       - name: Run tests
         env:
diff --git a/README.md b/README.md
index 1b38090..369f6e7 100644
--- a/README.md
+++ b/README.md
@@ -23,7 +23,9 @@
 生产宿主机（包括 Netcup）仅执行差异检查及改动脚本的 `bash -n`，不运行全量 ShellCheck 或完整测试集；
 分析和测试交由 CI：PR 按完整差异及依赖映射选择套件，README/许可证修改无需业务测试；
 公共设施或未知依赖改动回退全量，main 推送仍执行全量。两个必需 Job 始终运行，输出选择和跳过记录。
-ShellCheck 与语法检查仍覆盖全部脚本；文档修改无需本地全套测试，但仍须通过必需 CI。
+Ubuntu 使用固定 ShellCheck v0.10.0：所有受 Git 跟踪、位于 tests/ 之外的 .sh 文件执行 warning 门槛，tests/ 内的 .sh 文件执行 error 门槛；新目录中的生产 .sh 文件自动纳入，不维护生产文件白名单。Zsh 配置 p10k-config.zsh 不交给 Bash ShellCheck。两组 lint 都会执行并累计失败，Debian 不重复 lint。
+例外仅允许局部明确的 SC 规则编号和邻近理由；禁止文件级或全局 warning 抑制。测试 warning 不阻断不等于被 disable，禁止用抑制隐藏行为缺陷。CI 工作流改动继续触发全量测试回退；warning 门槛失败时后续 Ubuntu 行为套件不会执行，不能以 Debian 通过代替双环境验收。
+语法检查仍覆盖全部 .sh 脚本；文档修改无需本地全套测试，但仍须通过必需 CI。
 本机重测试必须使用原生资源限制及权限隔离；无法隔离或超限时停止，不自动提高额度或转宿主机执行。
 
 ## 快速开始
diff --git a/linux_setup.sh b/linux_setup.sh
index 6ca3c06..8a9e35b 100755
--- a/linux_setup.sh
+++ b/linux_setup.sh
@@ -208,7 +208,7 @@ pre_check() {
     local version_id
     local major_version
 
-    # shellcheck disable=SC1091
+    # shellcheck disable=SC1091  # /etc/os-release is provided by the target OS, not this repository.
     . /etc/os-release
     os_id="${ID:-}"
     version_id="${VERSION_ID:-}"
diff --git a/modules/docker-setup.sh b/modules/docker-setup.sh
index cd06c52..f0703f8 100644
--- a/modules/docker-setup.sh
+++ b/modules/docker-setup.sh
@@ -121,7 +121,7 @@ detect_supported_distribution() {
     local version_id
     local major_version
 
-    # shellcheck disable=SC1091
+    # shellcheck disable=SC1091  # /etc/os-release is provided by the target OS, not this repository.
     . /etc/os-release
     os_id="${ID:-}"
     version_id="${VERSION_ID:-}"
diff --git a/modules/system-customize.sh b/modules/system-customize.sh
index c290ed6..ac8d972 100644
--- a/modules/system-customize.sh
+++ b/modules/system-customize.sh
@@ -1913,7 +1913,6 @@ XANMOD_STAGED_SOURCE=""
 XANMOD_CANDIDATE_SOURCE=""
 XANMOD_ARMORED_KEY_TEMP=""
 XANMOD_ACTIVE_APT_LISTS_DIR=""
-XANMOD_ACTIVE_APT_LISTS_BUILDING=false
 XANMOD_ALLOCATION_CANDIDATE=""
 XANMOD_ALLOCATION_KIND=""
 XANMOD_ALLOCATION_OWNER_TOKEN=""
@@ -1951,7 +1950,6 @@ XANMOD_BACKUP_SNAPSHOT_BUILDING=false
 XANMOD_BACKUP_SNAPSHOT_REMOVED=false
 XANMOD_BACKUP_GROUP_SNAPSHOT_DIR=""
 XANMOD_BACKUP_STAGE_DIR=""
-XANMOD_BACKUP_STAGE_BUILDING=false
 XANMOD_BACKUP_TRANSACTION_ID=""
 XANMOD_CONFIGURATION_PREVIOUSLY_MANAGED=false
 XANMOD_BACKUP_SNAPSHOT_PATHS=()
@@ -2167,7 +2165,7 @@ get_locale_config_file() {
     local major_version=""
 
     if [[ -r /etc/os-release ]]; then
-        # shellcheck disable=SC1091
+        # shellcheck disable=SC1091  # /etc/os-release is provided by the target OS, not this repository.
         . /etc/os-release
         os_id="${ID:-}"
         version_id="${VERSION_ID:-}"
@@ -2282,7 +2280,7 @@ authorize_xanmod_install() {
 }
 get_os_codename() {
     if [[ -r "$XANMOD_OS_RELEASE" ]]; then
-        # shellcheck disable=SC1090
+        # shellcheck disable=SC1090  # Runtime OS-release path; test mode substitutes an isolated fixture.
         . "$XANMOD_OS_RELEASE"
         if [[ -n "${VERSION_CODENAME:-}" ]]; then
             echo "$VERSION_CODENAME"
@@ -3000,8 +2998,11 @@ xanmod_allocate_temp_directory() {
     [[ -d "$parent" && ! -L "$parent" ]] || return 1
     [[ -z "$XANMOD_ALLOCATION_CANDIDATE" && -z "$XANMOD_ALLOCATION_STATE" ]] || return 1
     printf -v "$path_variable" '%s' ""
-    printf -v "$building_variable" '%s' false
-    for attempt in {1..64}; do
+    # Callers without a building-state consumer omit this optional output.
+    if [[ -n "$building_variable" ]]; then
+        printf -v "$building_variable" "%s" false
+    fi
+    for (( attempt=1; attempt<=64; attempt++ )); do
         token=$(xanmod_random_token) || return 1
         owner_token=$(xanmod_random_token) || return 1
         candidate="$parent/$prefix.$token"
@@ -3069,7 +3070,7 @@ xanmod_allocate_temp_file() {
     [[ -d "$parent" && ! -L "$parent" ]] || return 1
     [[ -z "$XANMOD_ALLOCATION_CANDIDATE" && -z "$XANMOD_ALLOCATION_STATE" ]] || return 1
     printf -v "$path_variable" '%s' ""
-    for attempt in {1..64}; do
+    for (( attempt=1; attempt<=64; attempt++ )); do
         token=$(xanmod_random_token) || return 1
         owner_token=$(xanmod_random_token) || return 1
         candidate="$parent/$prefix.$token$suffix"
@@ -3123,13 +3124,11 @@ xanmod_allocate_temp_file() {
 
 cleanup_xanmod_active_apt_lists() {
     if [[ -z "$XANMOD_ACTIVE_APT_LISTS_DIR" ]]; then
-        XANMOD_ACTIVE_APT_LISTS_BUILDING=false
         return 0
     fi
     if [[ ! -e "$XANMOD_ACTIVE_APT_LISTS_DIR" && ! -L "$XANMOD_ACTIVE_APT_LISTS_DIR" ]] ||
         remove_xanmod_temp_directory "$XANMOD_ACTIVE_APT_LISTS_DIR" "临时 APT lists"; then
         XANMOD_ACTIVE_APT_LISTS_DIR=""
-        XANMOD_ACTIVE_APT_LISTS_BUILDING=false
         return 0
     fi
     return 1
@@ -3141,8 +3140,7 @@ xanmod_source_is_usable() {
     local temp_parent="${TMPDIR:-/tmp}"
 
     xanmod_allocate_temp_directory XANMOD_ACTIVE_APT_LISTS_DIR \
-        XANMOD_ACTIVE_APT_LISTS_BUILDING "$temp_parent" xanmod-apt-lists 0755 || return 1
-    XANMOD_ACTIVE_APT_LISTS_BUILDING=false
+        "" "$temp_parent" xanmod-apt-lists 0755 || return 1
     if ! install -d -m 0755 "$XANMOD_ACTIVE_APT_LISTS_DIR/partial"; then
         cleanup_xanmod_active_apt_lists || true
         return 1
@@ -3958,14 +3956,12 @@ commit_xanmod_backup_group() {
 
 cleanup_xanmod_backup_stage() {
     if [[ -z "$XANMOD_BACKUP_STAGE_DIR" ]]; then
-        XANMOD_BACKUP_STAGE_BUILDING=false
         return 0
     fi
     if ! remove_xanmod_temp_directory "$XANMOD_BACKUP_STAGE_DIR" "XanMod backup stage"; then
         return 1
     fi
     XANMOD_BACKUP_STAGE_DIR=""
-    XANMOD_BACKUP_STAGE_BUILDING=false
 }
 
 restore_xanmod_backup_group_snapshot() {
@@ -4062,11 +4058,10 @@ prepare_persistent_xanmod_backups() {
     create_xanmod_backup_group_snapshot || return 1
     XANMOD_BACKUP_TRANSACTION_ID=$(basename "$XANMOD_BACKUP_GROUP_SNAPSHOT_DIR")
     if ! xanmod_allocate_temp_directory XANMOD_BACKUP_STAGE_DIR \
-        XANMOD_BACKUP_STAGE_BUILDING "$XANMOD_BACKUP_STATE_DIR" .xanmod-backup-stage 0700; then
+        "" "$XANMOD_BACKUP_STATE_DIR" .xanmod-backup-stage 0700; then
         restore_xanmod_backup_group_snapshot || true
         return 1
     fi
-    XANMOD_BACKUP_STAGE_BUILDING=false
 
     if xanmod_configuration_looks_previously_managed; then
         XANMOD_CONFIGURATION_PREVIOUSLY_MANAGED=true
@@ -4296,7 +4291,7 @@ restore_xanmod_saved_trap() {
 
     trap - "$signal_name"
     if [[ -n "$trap_definition" ]]; then
-        # shellcheck disable=SC2294
+        # shellcheck disable=SC2294  # Restore shell-quoted code captured by trap -p; eval is intentional.
         eval "$trap_definition"
     fi
 }
diff --git a/modules/system-optimize.sh b/modules/system-optimize.sh
index ee4b15a..1ad5b76 100644
--- a/modules/system-optimize.sh
+++ b/modules/system-optimize.sh
@@ -333,7 +333,7 @@ get_ubuntu_kernel_meta_package() {
 
     kernel_version=$(uname -r)
     if [[ -r /etc/os-release ]]; then
-        # shellcheck disable=SC1091
+        # shellcheck disable=SC1091  # /etc/os-release is provided by the target OS, not this repository.
         . /etc/os-release
         version_id="${VERSION_ID:-}"
     fi
@@ -400,7 +400,7 @@ ensure_zram_kernel_module() {
 
     kernel_version=$(uname -r)
     if [[ -r /etc/os-release ]]; then
-        # shellcheck disable=SC1091
+        # shellcheck disable=SC1091  # /etc/os-release is provided by the target OS, not this repository.
         . /etc/os-release
         os_id="${ID:-}"
     fi
diff --git a/tests/test-lint-coverage.sh b/tests/test-lint-coverage.sh
new file mode 100644
index 0000000..bb14d00
--- /dev/null
+++ b/tests/test-lint-coverage.sh
@@ -0,0 +1,59 @@
+#!/usr/bin/env bash
+set -euo pipefail
+# Execute only the workflow lint block against inert files and a ShellCheck spy.
+ROOT_DIR=$(cd "$(dirname "${BASH_SOURCE[0]}")/.." && pwd)
+unset GH_TOKEN GITHUB_TOKEN SSH_PRIVATE_KEY_B64
+export GIT_CONFIG_NOSYSTEM=1 GIT_CONFIG_GLOBAL=/dev/null
+unset GIT_DIR GIT_WORK_TREE GIT_INDEX_FILE GIT_CONFIG_COUNT
+root=$(mktemp -d)
+cleanup() { rm -rf -- "$root"; }
+trap cleanup EXIT
+# Fail closed if the named step or its literal block changes shape.
+awk '
+    /^      - name: Run ShellCheck$/ { found++; step=1; next }
+    step && /^        run: \|$/ { block=1; next }
+    block && /^          / { print substr($0, 11); lines++; next }
+    block { step=0; block=0 }
+    END { if (found != 1 || lines == 0) exit 1 }
+' "$ROOT_DIR/.github/workflows/shell-tests.yml" > "$root/lint.sh"
+mkdir -p "$root/bin" "$root/repo"
+cat > "$root/bin/shellcheck" <<'STUB'
+#!/usr/bin/env bash
+set -euo pipefail
+[[ $1 == -x && $3 == -- && $# -gt 3 ]] || exit 90
+level=$2
+shift 3
+for path; do printf "%s\t%s\n" "$level" "$path" >> "$CAPTURE"; done
+case $level in
+    --severity=warning) exit "$PRODUCTION_STATUS" ;;
+    --severity=error) exit "$TEST_STATUS" ;;
+    *) exit 91 ;;
+esac
+STUB
+chmod +x "$root/bin/shellcheck"
+export PATH="$root/bin:$PATH" CAPTURE="$root/capture"
+cd "$root/repo"
+git init -q
+mkdir -p new/deep tests/nested
+touch entry.sh new/deep/production.sh "new/space name.sh" tests/direct.sh tests/nested/deep.sh ignored.zsh
+git add .
+touch untracked.sh
+printf "%s\n" \
+    $'--severity=warning\tentry.sh' \
+    $'--severity=warning\tnew/deep/production.sh' \
+    $'--severity=warning\tnew/space name.sh' \
+    $'--severity=error\ttests/direct.sh' \
+    $'--severity=error\ttests/nested/deep.sh' > "$root/expected"
+for PRODUCTION_STATUS in 0 1; do
+    for TEST_STATUS in 0 1; do
+        export PRODUCTION_STATUS TEST_STATUS
+        : > "$CAPTURE"
+        status=0
+        bash --noprofile --norc -e -o pipefail "$root/lint.sh" || status=$?
+        expected=0
+        if (( PRODUCTION_STATUS != 0 || TEST_STATUS != 0 )); then expected=1; fi
+        [[ $status == "$expected" ]]
+        diff -u "$root/expected" "$CAPTURE"
+        printf "PASS: workflow lint production=%s tests=%s exit=%s\n" "$PRODUCTION_STATUS" "$TEST_STATUS" "$status"
+    done
+done
diff --git a/tests/test-push-worker-registration.sh b/tests/test-push-worker-registration.sh
index c19aaec..3ef0fcf 100755
--- a/tests/test-push-worker-registration.sh
+++ b/tests/test-push-worker-registration.sh
@@ -126,12 +126,9 @@ setup_fixture() {
     CURRENT_FIXTURE_ROOT=$root
     mkdir -m 0700 "$root" "$root/runtime" "$root/capture"
     TMPDIR="$root/runtime"; initialize_runtime
-    # shellcheck disable=SC2034
     MAX_PARALLEL=2
-    # shellcheck disable=SC2034
     MAX_RETRIES=1
     BATCH_WORKER_FAILED=false
-    # shellcheck disable=SC2034
     BATCH_WORKER_ERROR=false
 }
 assert_no_registration_residue() {
@@ -219,7 +216,6 @@ CHILD
     leader_start=$(wait_test_process_start "$leader"); read_process_record "$leader"
     WORKER_TRANSFER_PID=$leader; WORKER_TRANSFER_START=$leader_start; WORKER_TRANSFER_PGID=$PROC_PGID; WORKER_TRANSFER_SID=$PROC_SID
     publish_worker_session_state active; state_file=$WORKER_SESSION_STATE_FILE
-    # shellcheck disable=SC2034  # Consumed by sourced push cleanup state machine.
     MANAGED_SESSION_CLEANUP_TICKS=300
     rc=0; terminate_worker_transfer || rc=$?
     (( rc != 0 )) || fail "deadline failure unexpectedly succeeded"
@@ -295,7 +291,6 @@ run_with_watchdog root-cause 20 root_cause_regression_case
 
 run_ready_failure_case() (
     kind="$1"; root="$TEST_DIR/ready-$kind"; setup_fixture "$root"
-    # shellcheck disable=SC2034
     WORKER_REGISTRATION_TIMEOUT_TICKS=10
     push_to_server() { : > "$root/capture/transfer"; return 0; }
     case "$kind" in
@@ -385,9 +380,7 @@ prune_identity_failure_case repeated
     root="$TEST_DIR/prune-cleanup-failure"; setup_fixture "$root"
     sleep 300 & worker=$!; read_process_record "$worker"; start=$PROC_START
     ACTIVE_WORKERS[$worker]=$start
-    # shellcheck disable=SC2034
     ACTIVE_WORKER_STATE_FILES[$worker]="$TEMP_DIR/worker-session.$worker.state"
-    # shellcheck disable=SC2034
     ACTIVE_WORKER_STATE_STARTS[$worker]=$start
     eval "$(declare -f process_identity_matches | sed '1s/process_identity_matches/original_process_identity_matches/')"
     eval "$(declare -f read_process_record_for_session_scan | sed '1s/read_process_record_for_session_scan/original_read_process_record_for_session_scan/')"
@@ -410,9 +403,7 @@ prune_identity_failure_case repeated
     root="$TEST_DIR/prune-exited"; setup_fixture "$root"
     sleep 0.1 & worker=$!; read_process_record "$worker"; start=$PROC_START
     ACTIVE_WORKERS[$worker]=$start
-    # shellcheck disable=SC2034
     ACTIVE_WORKER_STATE_FILES[$worker]="$TEMP_DIR/worker-session.$worker.state"
-    # shellcheck disable=SC2034
     ACTIVE_WORKER_STATE_STARTS[$worker]=$start
     sleep 0.2; prune_active_workers
     assert_eq 0 "${#ACTIVE_WORKERS[@]}" "exited worker is normally reaped"
@@ -578,7 +569,6 @@ pass "failed managed-session reap remains bounded for 20 deterministic runs"
     TEMP_DIR=$(dirname "$state_file")
     ACTIVE_WORKERS=(); ACTIVE_WORKER_STATE_FILES=(); ACTIVE_WORKER_STATE_STARTS=()
     BATCH_WORKER_FAILED=false
-    # shellcheck disable=SC2034  # Consumed by sourced worker accounting.
     BATCH_WORKER_ERROR=false
     MAX_PARALLEL=1
     ACTIVE_WORKERS[$worker]=$worker_start
@@ -614,7 +604,6 @@ pass "failed managed-session reap remains bounded for 20 deterministic runs"
 (
     trap - EXIT HUP INT TERM
     leader=424242; leader_start=777777; wait_called=false; after_wait=false
-    # shellcheck disable=SC2034  # Test double fills caller arrays through namerefs.
     collect_owned_session_records() {
         local -n pids_ref="$2" starts_ref="$3" ppids_ref="$4" pgids_ref="$5" states_ref="$6"
         pids_ref=(); starts_ref=(); ppids_ref=(); pgids_ref=(); states_ref=()
@@ -717,13 +706,11 @@ run_preserved_cleanup_retry_case() (
     local run="$1" root runtime runtime_dev runtime_inode credential leader leader_start leader_pgid leader_sid state_file
     local owner watchdog rc=0 metadata="" state_status=0
     local -a session_pids=()
-    # shellcheck disable=SC2034  # Filled through collect_owned_session_records namerefs.
     local -A session_starts=() session_ppids=() session_pgids=() session_states=()
     root="$TEST_DIR/runtime-evidence-retry-$run"; setup_fixture "$root"
     runtime=$TEMP_DIR; runtime_dev=$TEMP_DIR_DEV; runtime_inode=$TEMP_DIR_INODE
     credential="$runtime/private-key"
     printf 'fixture-credential-do-not-print\n' > "$credential"; chmod 0600 "$credential"
-    # shellcheck disable=SC2034  # Consumed by sourced runtime cleanup.
     RUNTIME_KEY_FILE=$credential
 
     setsid bash -c 'trap "" HUP INT TERM; kill -STOP "$BASHPID"; while :; do :; done' & leader=$!
@@ -949,7 +936,6 @@ run_runtime_retention_signal_case() (
     local signal_name="$1" expected="$2" root leader="" leader_start="" leader_pgid="" leader_sid="" target="" target_pid="" target_start=""
     local runtime runtime_dev runtime_inode state_file credential watchdog="" rc=0 line key value state_status=0 reap_status=0
     local -a session_pids=()
-    # shellcheck disable=SC2034  # Filled through collect_owned_session_records namerefs.
     local -A session_starts=() session_ppids=() session_pgids=() session_states=()
     cleanup_runtime_retention_signal_fixture() {
         if [[ -n "$target" ]]; then kill -KILL "$target" 2>/dev/null || true; wait "$target" 2>/dev/null || true; fi
@@ -1172,7 +1158,6 @@ done
 
 run_parallel_fallback_iteration() (
     run="$1"; root="$TEST_DIR/session-parallel-$run"; setup_fixture "$root"
-    # shellcheck disable=SC2034  # consumed by sourced run_server_batch
     MAX_PARALLEL=2
     push_to_server() {
         local server="$1" lock_fd
@@ -1180,13 +1165,9 @@ run_parallel_fallback_iteration() (
         printf '%s\n' "$server" >> "$root/capture/calls"; : > "$root/capture/ready.$server"
         flock -u "$lock_fd"; exec {lock_fd}>&-
         while [[ ! -e "$root/capture/release" ]]; do sleep 0.01; done
-        # shellcheck disable=SC2034  # consumed by sourced state publisher
         WORKER_TRANSFER_PID=$BASHPID
-        # shellcheck disable=SC2034  # consumed by sourced state publisher
         WORKER_TRANSFER_START=11
-        # shellcheck disable=SC2034  # consumed by sourced state publisher
         WORKER_TRANSFER_PGID=$BASHPID
-        # shellcheck disable=SC2034  # consumed by sourced state publisher
         WORKER_TRANSFER_SID=$BASHPID
         publish_worker_session_state cleanup_failed
         return "$MANAGED_CLEANUP_FAILURE_STATUS"
@@ -1373,7 +1354,6 @@ run_live_cleanup_failure_signal_case() (
     }
     trap cleanup_live_failure_fixture EXIT
     local -a session_pids=()
-    # shellcheck disable=SC2034  # Filled by collect_owned_session_records namerefs.
     local -A session_starts=() session_ppids=() session_pgids=() session_states=()
     root="$TEST_DIR/live-cleanup-failure-$signal_name"; CURRENT_FIXTURE_ROOT=$root
     write_active_grace_fixture "$root"
@@ -1459,7 +1439,6 @@ run_state_publication_signal_case() (
     local state="$1" phase="$2" signal_name="$3" expected="$4" mode root main_pid="" main_start="" worker_pid="" worker_start="" leader_pid="" leader_start="" managed_sid=""
     local watchdog="" watchdog_start="" unrelated="" unrelated_start="" rc=0 line key value marker state_file hook_stage
     local -a session_pids=()
-    # shellcheck disable=SC2034  # Filled by collect_owned_session_records namerefs.
     local -A session_starts=() session_ppids=() session_pgids=() session_states=()
     cleanup_publication_fixture() {
         [[ -z "$worker_pid" || -z "$worker_start" ]] || { test_process_identity_exists "$worker_pid" "$worker_start" && kill -KILL "$worker_pid" 2>/dev/null || true; }
diff --git a/tests/test-push.sh b/tests/test-push.sh
index fbc675b..768b922 100644
--- a/tests/test-push.sh
+++ b/tests/test-push.sh
@@ -1,5 +1,4 @@
 #!/usr/bin/env bash
-# shellcheck disable=SC2034  # Test globals are consumed by sourced tools/push.sh functions.
 set -euo pipefail
 
 ROOT_DIR=$(cd "$(dirname "${BASH_SOURCE[0]}")/.." && pwd)
diff --git a/tools/xanmod-install.sh b/tools/xanmod-install.sh
index a7fa655..98179ec 100755
--- a/tools/xanmod-install.sh
+++ b/tools/xanmod-install.sh
@@ -66,7 +66,6 @@ XANMOD_STAGED_SOURCE=""
 XANMOD_CANDIDATE_SOURCE=""
 XANMOD_ARMORED_KEY_TEMP=""
 XANMOD_ACTIVE_APT_LISTS_DIR=""
-XANMOD_ACTIVE_APT_LISTS_BUILDING=false
 XANMOD_ALLOCATION_CANDIDATE=""
 XANMOD_ALLOCATION_KIND=""
 XANMOD_ALLOCATION_OWNER_TOKEN=""
@@ -185,7 +184,7 @@ ensure_package() {
 }
 get_os_codename() {
     if [[ -r "$XANMOD_OS_RELEASE" ]]; then
-        # shellcheck disable=SC1090
+        # shellcheck disable=SC1090  # Runtime OS-release path; test mode substitutes an isolated fixture.
         . "$XANMOD_OS_RELEASE"
         if [[ -n "${VERSION_CODENAME:-}" ]]; then
             echo "$VERSION_CODENAME"
@@ -899,8 +898,11 @@ xanmod_allocate_temp_directory() {
     [[ -d "$parent" && ! -L "$parent" ]] || return 1
     [[ -z "$XANMOD_ALLOCATION_CANDIDATE" && -z "$XANMOD_ALLOCATION_STATE" ]] || return 1
     printf -v "$path_variable" '%s' ""
-    printf -v "$building_variable" '%s' false
-    for attempt in {1..64}; do
+    # Callers without a building-state consumer omit this optional output.
+    if [[ -n "$building_variable" ]]; then
+        printf -v "$building_variable" "%s" false
+    fi
+    for (( attempt=1; attempt<=64; attempt++ )); do
         token=$(xanmod_random_token) || return 1
         owner_token=$(xanmod_random_token) || return 1
         candidate="$parent/$prefix.$token"
@@ -968,7 +970,7 @@ xanmod_allocate_temp_file() {
     [[ -d "$parent" && ! -L "$parent" ]] || return 1
     [[ -z "$XANMOD_ALLOCATION_CANDIDATE" && -z "$XANMOD_ALLOCATION_STATE" ]] || return 1
     printf -v "$path_variable" '%s' ""
-    for attempt in {1..64}; do
+    for (( attempt=1; attempt<=64; attempt++ )); do
         token=$(xanmod_random_token) || return 1
         owner_token=$(xanmod_random_token) || return 1
         candidate="$parent/$prefix.$token$suffix"
@@ -1022,13 +1024,11 @@ xanmod_allocate_temp_file() {
 
 cleanup_xanmod_active_apt_lists() {
     if [[ -z "$XANMOD_ACTIVE_APT_LISTS_DIR" ]]; then
-        XANMOD_ACTIVE_APT_LISTS_BUILDING=false
         return 0
     fi
     if [[ ! -e "$XANMOD_ACTIVE_APT_LISTS_DIR" && ! -L "$XANMOD_ACTIVE_APT_LISTS_DIR" ]] ||
         remove_xanmod_temp_directory "$XANMOD_ACTIVE_APT_LISTS_DIR" "临时 APT lists"; then
         XANMOD_ACTIVE_APT_LISTS_DIR=""
-        XANMOD_ACTIVE_APT_LISTS_BUILDING=false
         return 0
     fi
     return 1
@@ -1040,8 +1040,7 @@ xanmod_source_is_usable() {
     local temp_parent="${TMPDIR:-/tmp}"
 
     xanmod_allocate_temp_directory XANMOD_ACTIVE_APT_LISTS_DIR \
-        XANMOD_ACTIVE_APT_LISTS_BUILDING "$temp_parent" xanmod-apt-lists 0755 || return 1
-    XANMOD_ACTIVE_APT_LISTS_BUILDING=false
+        "" "$temp_parent" xanmod-apt-lists 0755 || return 1
     if ! install -d -m 0755 "$XANMOD_ACTIVE_APT_LISTS_DIR/partial"; then
         cleanup_xanmod_active_apt_lists || true
         return 1
@@ -1227,7 +1226,7 @@ restore_xanmod_saved_trap() {
 
     trap - "$signal_name"
     if [[ -n "$trap_definition" ]]; then
-        # shellcheck disable=SC2294
+        # shellcheck disable=SC2294  # Restore shell-quoted code captured by trap -p; eval is intentional.
         eval "$trap_definition"
     fi
 }