diff --git a/.gitea/workflows/quality-gates-github.yml b/.gitea/workflows/quality-gates-github.yml
index cba0f4b..ffd74b5 100644
--- a/.gitea/workflows/quality-gates-github.yml
+++ b/.gitea/workflows/quality-gates-github.yml
@@ -78,6 +78,89 @@ jobs:
             exit 0
           fi
 
+          # (b) ARG fuori scope: una ARG vale nello stage che la dichiara e in
+          # quelli che ne derivano (FROM <stage>), come le ENV; quelle dichiarate
+          # prima del primo FROM valgono solo nelle righe FROM. Verificato sul
+          # log di BuildKit di nuxt-vue-components-docs v1.0.13: `FROM base AS
+          # deps` vede la NPM_VERSION dichiarata in `base`.
+          arg_scope() {
+            ${AWK:-awk} '
+            function trim(s) { sub(/^[ \t]+/, "", s); sub(/[ \t]+$/, "", s); return s }
+            # Nomi dichiarati da ARG/ENV: "A", "A=1", "A=1 B=2", "A valore".
+            function declared(rest, out,   n, i, t) {
+              rest = trim(rest)
+              split("", out)
+              if (rest !~ /=/) { n = split(rest, t, /[ \t]+/); if (n > 0) out[t[1]] = 1; return }
+              n = split(rest, t, /[ \t]+/)
+              for (i = 1; i <= n; i++)
+                if (t[i] ~ /^[A-Za-z_][A-Za-z0-9_]*(=|$)/) { sub(/=.*/, "", t[i]); out[t[i]] = 1 }
+            }
+            function handle(kw, rest, ln,   n, i, t, base, alias, k, p, s, v, d) {
+              if (pass == 1) {
+                if (kw == "ARG") { declared(rest, d); for (k in d) allargs[k] = 1 }
+                return
+              }
+              if (kw == "FROM") {
+                n = split(trim(rest), t, /[ \t]+/); i = 1
+                while (i <= n && t[i] ~ /^--/) i++
+                base = tolower(t[i]); alias = ""
+                if (i + 2 <= n && toupper(t[i + 1]) == "AS") alias = tolower(t[i + 2])
+                stages++
+                stage = (alias != "" ? alias : "#" stages)
+                split("", scope); split("", inh)
+                for (k in varof) { split(k, p, SUBSEP); if (p[1] == base) inh[p[2]] = 1 }
+                for (k in inh) { scope[k] = 1; varof[stage, k] = 1 }
+                return
+              }
+              if (stage == "") return
+              if (kw == "ARG") { declared(rest, d); for (k in d) { scope[k] = 1; varof[stage, k] = 1 }; return }
+              s = rest
+              while (match(s, /[$][{]?[A-Za-z_][A-Za-z0-9_]*/)) {
+                v = substr(s, RSTART, RLENGTH); sub(/^[$][{]?/, "", v)
+                s = substr(s, RSTART + RLENGTH)
+                if ((v in allargs) && !(v in scope) && !(v in predefined) && !((ln, v) in seen)) {
+                  seen[ln, v] = 1
+                  printf "%d\t%s\t%s\n", ln, v, stage
+                }
+              }
+              if (kw == "ENV") { declared(rest, d); for (k in d) { scope[k] = 1; varof[stage, k] = 1 } }
+            }
+            function flush() {
+              if (buf != "" && match(buf, /^[ \t]*[A-Za-z]+/)) {
+                kw = toupper(trim(substr(buf, RSTART, RLENGTH)))
+                handle(kw, substr(buf, RSTART + RLENGTH), start)
+              }
+              buf = ""
+            }
+            BEGIN {
+              np = split("TARGETPLATFORM TARGETOS TARGETARCH TARGETVARIANT BUILDPLATFORM BUILDOS BUILDARCH BUILDVARIANT HTTP_PROXY HTTPS_PROXY FTP_PROXY NO_PROXY ALL_PROXY http_proxy https_proxy ftp_proxy no_proxy all_proxy", pp, " ")
+              for (i = 1; i <= np; i++) predefined[pp[i]] = 1
+            }
+            FNR == 1 { pass++; buf = ""; stage = ""; stages = 0; split("", scope); split("", varof) }
+            {
+              line = $0; sub(/\r$/, "", line)
+              if (line ~ /^[ \t]*#/) next                       # commenti, anche dentro una continuazione
+              if (buf == "" && line ~ /^[ \t]*$/) next
+              if (buf == "") start = FNR
+              if (line ~ /\\[ \t]*$/) { sub(/\\[ \t]*$/, " ", line); buf = buf line; next }
+              buf = buf line
+              flush()
+            }
+            ' "$1" "$1"
+          }
+
+          # Caso di prova: se l'awk di questo runner non riconosce una ARG fuori
+          # scope nota, il controllo (b) non e' affidabile e lo si dice, invece di
+          # dichiarare in regola un Dockerfile che non si e' potuto leggere.
+          argcheck=1
+          prova=$(mktemp)
+          printf 'ARG X=1\nFROM scratch AS a\nRUN echo ${X}\n' > "$prova"
+          if [ "$(arg_scope "$prova" 2>/dev/null | cut -f2)" != "X" ]; then
+            argcheck=0
+            echo "::warning::Guardia Dockerfile: l'analisi delle ARG non funziona con l'awk di questo runner ($(${AWK:-awk} -W version 2>&1 | head -1)). Il controllo (b) e' saltato, il (a) resta."
+          fi
+          rm -f "$prova"
+
           findings=""
           for f in $files; do
             # (a) registry: npm confronta l'URL del lockfile come stringa, e i lockfile
@@ -88,74 +171,9 @@ jobs:
           "
             fi
 
-            # (b) ARG fuori scope: una ARG vale nello stage che la dichiara e in
-            # quelli che ne derivano (FROM <stage>), come le ENV; quelle dichiarate
-            # prima del primo FROM valgono solo nelle righe FROM. Verificato sul
-            # log di BuildKit di nuxt-vue-components-docs v1.0.13: `FROM base AS
-            # deps` vede la NPM_VERSION dichiarata in `base`.
-            args=$(${AWK:-awk} '
-              function trim(s) { sub(/^[ \t]+/, "", s); sub(/[ \t]+$/, "", s); return s }
-              # Nomi dichiarati da ARG/ENV: "A", "A=1", "A=1 B=2", "A valore".
-              function declared(rest, out,   n, i, t) {
-                rest = trim(rest)
-                split("", out)
-                if (rest !~ /=/) { n = split(rest, t, /[ \t]+/); if (n > 0) out[t[1]] = 1; return }
-                n = split(rest, t, /[ \t]+/)
-                for (i = 1; i <= n; i++)
-                  if (t[i] ~ /^[A-Za-z_][A-Za-z0-9_]*(=|$)/) { sub(/=.*/, "", t[i]); out[t[i]] = 1 }
-              }
-              function handle(kw, rest, ln,   n, i, t, base, alias, k, p, s, v, d) {
-                if (pass == 1) {
-                  if (kw == "ARG") { declared(rest, d); for (k in d) allargs[k] = 1 }
-                  return
-                }
-                if (kw == "FROM") {
-                  n = split(trim(rest), t, /[ \t]+/); i = 1
-                  while (i <= n && t[i] ~ /^--/) i++
-                  base = tolower(t[i]); alias = ""
-                  if (i + 2 <= n && toupper(t[i + 1]) == "AS") alias = tolower(t[i + 2])
-                  stages++
-                  stage = (alias != "" ? alias : "#" stages)
-                  split("", scope); split("", inh)
-                  for (k in varof) { split(k, p, SUBSEP); if (p[1] == base) inh[p[2]] = 1 }
-                  for (k in inh) { scope[k] = 1; varof[stage, k] = 1 }
-                  return
-                }
-                if (stage == "") return
-                if (kw == "ARG") { declared(rest, d); for (k in d) { scope[k] = 1; varof[stage, k] = 1 }; return }
-                s = rest
-                while (match(s, /\$\{?[A-Za-z_][A-Za-z0-9_]*/)) {
-                  v = substr(s, RSTART, RLENGTH); sub(/^\$\{?/, "", v)
-                  s = substr(s, RSTART + RLENGTH)
-                  if ((v in allargs) && !(v in scope) && !(v in predefined) && !((ln, v) in seen)) {
-                    seen[ln, v] = 1
-                    printf "%d\t%s\t%s\n", ln, v, stage
-                  }
-                }
-                if (kw == "ENV") { declared(rest, d); for (k in d) { scope[k] = 1; varof[stage, k] = 1 } }
-              }
-              function flush() {
-                if (buf != "" && match(buf, /^[ \t]*[A-Za-z]+/)) {
-                  kw = toupper(trim(substr(buf, RSTART, RLENGTH)))
-                  handle(kw, substr(buf, RSTART + RLENGTH), start)
-                }
-                buf = ""
-              }
-              BEGIN {
-                np = split("TARGETPLATFORM TARGETOS TARGETARCH TARGETVARIANT BUILDPLATFORM BUILDOS BUILDARCH BUILDVARIANT HTTP_PROXY HTTPS_PROXY FTP_PROXY NO_PROXY ALL_PROXY http_proxy https_proxy ftp_proxy no_proxy all_proxy", pp, " ")
-                for (i = 1; i <= np; i++) predefined[pp[i]] = 1
-              }
-              FNR == 1 { pass++; buf = ""; stage = ""; stages = 0; split("", scope); split("", varof) }
-              {
-                line = $0; sub(/\r$/, "", line)
-                if (line ~ /^[ \t]*#/) next                       # commenti, anche dentro una continuazione
-                if (buf == "" && line ~ /^[ \t]*$/) next
-                if (buf == "") start = FNR
-                if (line ~ /\\[ \t]*$/) { sub(/\\[ \t]*$/, " ", line); buf = buf line; next }
-                buf = buf line
-                flush()
-              }
-            ' "$f" "$f" 2>/dev/null)
+            # (b) ARG fuori scope, con arg_scope definita sopra.
+            args=""
+            [ "$argcheck" = "1" ] && args=$(arg_scope "$f" 2>/dev/null)
             while IFS='	' read -r n v st; do
               [ -n "$n" ] || continue
               findings="${findings}${f}	${n}	arg	${v}	${st}
@@ -166,7 +184,11 @@ jobs:
           done
 
           if [ -z "$findings" ]; then
-            echo "Dockerfile: registry @pzeta e ARG per stage in regola."
+            if [ "$argcheck" = "1" ]; then
+              echo "Dockerfile: registry @pzeta e ARG per stage in regola."
+            else
+              echo "Dockerfile: registry @pzeta in regola; ARG per stage non verificate (vedi l'avviso sopra)."
+            fi
             exit 0
           fi
 
diff --git a/.gitea/workflows/quality-gates.yml b/.gitea/workflows/quality-gates.yml
index 03798ba..2d29e4e 100644
--- a/.gitea/workflows/quality-gates.yml
+++ b/.gitea/workflows/quality-gates.yml
@@ -157,6 +157,89 @@ jobs:
             exit 0
           fi
 
+          # (b) ARG fuori scope: una ARG vale nello stage che la dichiara e in
+          # quelli che ne derivano (FROM <stage>), come le ENV; quelle dichiarate
+          # prima del primo FROM valgono solo nelle righe FROM. Verificato sul
+          # log di BuildKit di nuxt-vue-components-docs v1.0.13: `FROM base AS
+          # deps` vede la NPM_VERSION dichiarata in `base`.
+          arg_scope() {
+            ${AWK:-awk} '
+            function trim(s) { sub(/^[ \t]+/, "", s); sub(/[ \t]+$/, "", s); return s }
+            # Nomi dichiarati da ARG/ENV: "A", "A=1", "A=1 B=2", "A valore".
+            function declared(rest, out,   n, i, t) {
+              rest = trim(rest)
+              split("", out)
+              if (rest !~ /=/) { n = split(rest, t, /[ \t]+/); if (n > 0) out[t[1]] = 1; return }
+              n = split(rest, t, /[ \t]+/)
+              for (i = 1; i <= n; i++)
+                if (t[i] ~ /^[A-Za-z_][A-Za-z0-9_]*(=|$)/) { sub(/=.*/, "", t[i]); out[t[i]] = 1 }
+            }
+            function handle(kw, rest, ln,   n, i, t, base, alias, k, p, s, v, d) {
+              if (pass == 1) {
+                if (kw == "ARG") { declared(rest, d); for (k in d) allargs[k] = 1 }
+                return
+              }
+              if (kw == "FROM") {
+                n = split(trim(rest), t, /[ \t]+/); i = 1
+                while (i <= n && t[i] ~ /^--/) i++
+                base = tolower(t[i]); alias = ""
+                if (i + 2 <= n && toupper(t[i + 1]) == "AS") alias = tolower(t[i + 2])
+                stages++
+                stage = (alias != "" ? alias : "#" stages)
+                split("", scope); split("", inh)
+                for (k in varof) { split(k, p, SUBSEP); if (p[1] == base) inh[p[2]] = 1 }
+                for (k in inh) { scope[k] = 1; varof[stage, k] = 1 }
+                return
+              }
+              if (stage == "") return
+              if (kw == "ARG") { declared(rest, d); for (k in d) { scope[k] = 1; varof[stage, k] = 1 }; return }
+              s = rest
+              while (match(s, /[$][{]?[A-Za-z_][A-Za-z0-9_]*/)) {
+                v = substr(s, RSTART, RLENGTH); sub(/^[$][{]?/, "", v)
+                s = substr(s, RSTART + RLENGTH)
+                if ((v in allargs) && !(v in scope) && !(v in predefined) && !((ln, v) in seen)) {
+                  seen[ln, v] = 1
+                  printf "%d\t%s\t%s\n", ln, v, stage
+                }
+              }
+              if (kw == "ENV") { declared(rest, d); for (k in d) { scope[k] = 1; varof[stage, k] = 1 } }
+            }
+            function flush() {
+              if (buf != "" && match(buf, /^[ \t]*[A-Za-z]+/)) {
+                kw = toupper(trim(substr(buf, RSTART, RLENGTH)))
+                handle(kw, substr(buf, RSTART + RLENGTH), start)
+              }
+              buf = ""
+            }
+            BEGIN {
+              np = split("TARGETPLATFORM TARGETOS TARGETARCH TARGETVARIANT BUILDPLATFORM BUILDOS BUILDARCH BUILDVARIANT HTTP_PROXY HTTPS_PROXY FTP_PROXY NO_PROXY ALL_PROXY http_proxy https_proxy ftp_proxy no_proxy all_proxy", pp, " ")
+              for (i = 1; i <= np; i++) predefined[pp[i]] = 1
+            }
+            FNR == 1 { pass++; buf = ""; stage = ""; stages = 0; split("", scope); split("", varof) }
+            {
+              line = $0; sub(/\r$/, "", line)
+              if (line ~ /^[ \t]*#/) next                       # commenti, anche dentro una continuazione
+              if (buf == "" && line ~ /^[ \t]*$/) next
+              if (buf == "") start = FNR
+              if (line ~ /\\[ \t]*$/) { sub(/\\[ \t]*$/, " ", line); buf = buf line; next }
+              buf = buf line
+              flush()
+            }
+            ' "$1" "$1"
+          }
+
+          # Caso di prova: se l'awk di questo runner non riconosce una ARG fuori
+          # scope nota, il controllo (b) non e' affidabile e lo si dice, invece di
+          # dichiarare in regola un Dockerfile che non si e' potuto leggere.
+          argcheck=1
+          prova=$(mktemp)
+          printf 'ARG X=1\nFROM scratch AS a\nRUN echo ${X}\n' > "$prova"
+          if [ "$(arg_scope "$prova" 2>/dev/null | cut -f2)" != "X" ]; then
+            argcheck=0
+            echo "::warning::Guardia Dockerfile: l'analisi delle ARG non funziona con l'awk di questo runner ($(${AWK:-awk} -W version 2>&1 | head -1)). Il controllo (b) e' saltato, il (a) resta."
+          fi
+          rm -f "$prova"
+
           findings=""
           for f in $files; do
             # (a) registry: npm confronta l'URL del lockfile come stringa, e i lockfile
@@ -167,74 +250,9 @@ jobs:
           "
             fi
 
-            # (b) ARG fuori scope: una ARG vale nello stage che la dichiara e in
-            # quelli che ne derivano (FROM <stage>), come le ENV; quelle dichiarate
-            # prima del primo FROM valgono solo nelle righe FROM. Verificato sul
-            # log di BuildKit di nuxt-vue-components-docs v1.0.13: `FROM base AS
-            # deps` vede la NPM_VERSION dichiarata in `base`.
-            args=$(${AWK:-awk} '
-              function trim(s) { sub(/^[ \t]+/, "", s); sub(/[ \t]+$/, "", s); return s }
-              # Nomi dichiarati da ARG/ENV: "A", "A=1", "A=1 B=2", "A valore".
-              function declared(rest, out,   n, i, t) {
-                rest = trim(rest)
-                split("", out)
-                if (rest !~ /=/) { n = split(rest, t, /[ \t]+/); if (n > 0) out[t[1]] = 1; return }
-                n = split(rest, t, /[ \t]+/)
-                for (i = 1; i <= n; i++)
-                  if (t[i] ~ /^[A-Za-z_][A-Za-z0-9_]*(=|$)/) { sub(/=.*/, "", t[i]); out[t[i]] = 1 }
-              }
-              function handle(kw, rest, ln,   n, i, t, base, alias, k, p, s, v, d) {
-                if (pass == 1) {
-                  if (kw == "ARG") { declared(rest, d); for (k in d) allargs[k] = 1 }
-                  return
-                }
-                if (kw == "FROM") {
-                  n = split(trim(rest), t, /[ \t]+/); i = 1
-                  while (i <= n && t[i] ~ /^--/) i++
-                  base = tolower(t[i]); alias = ""
-                  if (i + 2 <= n && toupper(t[i + 1]) == "AS") alias = tolower(t[i + 2])
-                  stages++
-                  stage = (alias != "" ? alias : "#" stages)
-                  split("", scope); split("", inh)
-                  for (k in varof) { split(k, p, SUBSEP); if (p[1] == base) inh[p[2]] = 1 }
-                  for (k in inh) { scope[k] = 1; varof[stage, k] = 1 }
-                  return
-                }
-                if (stage == "") return
-                if (kw == "ARG") { declared(rest, d); for (k in d) { scope[k] = 1; varof[stage, k] = 1 }; return }
-                s = rest
-                while (match(s, /\$\{?[A-Za-z_][A-Za-z0-9_]*/)) {
-                  v = substr(s, RSTART, RLENGTH); sub(/^\$\{?/, "", v)
-                  s = substr(s, RSTART + RLENGTH)
-                  if ((v in allargs) && !(v in scope) && !(v in predefined) && !((ln, v) in seen)) {
-                    seen[ln, v] = 1
-                    printf "%d\t%s\t%s\n", ln, v, stage
-                  }
-                }
-                if (kw == "ENV") { declared(rest, d); for (k in d) { scope[k] = 1; varof[stage, k] = 1 } }
-              }
-              function flush() {
-                if (buf != "" && match(buf, /^[ \t]*[A-Za-z]+/)) {
-                  kw = toupper(trim(substr(buf, RSTART, RLENGTH)))
-                  handle(kw, substr(buf, RSTART + RLENGTH), start)
-                }
-                buf = ""
-              }
-              BEGIN {
-                np = split("TARGETPLATFORM TARGETOS TARGETARCH TARGETVARIANT BUILDPLATFORM BUILDOS BUILDARCH BUILDVARIANT HTTP_PROXY HTTPS_PROXY FTP_PROXY NO_PROXY ALL_PROXY http_proxy https_proxy ftp_proxy no_proxy all_proxy", pp, " ")
-                for (i = 1; i <= np; i++) predefined[pp[i]] = 1
-              }
-              FNR == 1 { pass++; buf = ""; stage = ""; stages = 0; split("", scope); split("", varof) }
-              {
-                line = $0; sub(/\r$/, "", line)
-                if (line ~ /^[ \t]*#/) next                       # commenti, anche dentro una continuazione
-                if (buf == "" && line ~ /^[ \t]*$/) next
-                if (buf == "") start = FNR
-                if (line ~ /\\[ \t]*$/) { sub(/\\[ \t]*$/, " ", line); buf = buf line; next }
-                buf = buf line
-                flush()
-              }
-            ' "$f" "$f" 2>/dev/null)
+            # (b) ARG fuori scope, con arg_scope definita sopra.
+            args=""
+            [ "$argcheck" = "1" ] && args=$(arg_scope "$f" 2>/dev/null)
             while IFS='	' read -r n v st; do
               [ -n "$n" ] || continue
               findings="${findings}${f}	${n}	arg	${v}	${st}
@@ -245,7 +263,11 @@ jobs:
           done
 
           if [ -z "$findings" ]; then
-            echo "Dockerfile: registry @pzeta e ARG per stage in regola."
+            if [ "$argcheck" = "1" ]; then
+              echo "Dockerfile: registry @pzeta e ARG per stage in regola."
+            else
+              echo "Dockerfile: registry @pzeta in regola; ARG per stage non verificate (vedi l'avviso sopra)."
+            fi
             exit 0
           fi