test: guard LABELS.md against any concrete scope name

The regression row grepped only the four current ceremony names, so a
future enumeration under new names stayed green. Widen the pattern to
scope:[a-z0-9] — any concrete label name, in any shape, re-reds the row,
while doctrine's bare `scope:` and wildcard scope:* stay allowed (#104).

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

test/labels.test.sh

@@ -57,8 +57,12 @@ check "PR author is recused from the required panel" 0 "one three" printf '%s\n'
 # scope enumeration it carries is true at home and false everywhere else —
 # 14 of 16 vendored rows were false across the family when this fired (#104).
 # The set lives in labels.conf and the repo's CONTRIBUTING; the mirror never
-# names it. grep -c prints the count and exits 1 when that count is 0.
+# names it. A concrete label is `scope:` followed by a name character — the
+# doctrine spellings (bare `scope:`, wildcard `scope:*`) put a backtick or `*`
+# there instead, so any name, current or future, in any shape (table row,
+# name|color|description row, prose) re-reds this while doctrine stays green.
+# grep -c prints the count and exits 1 when that count is 0.
 check "LABELS.md enumerates no repo's scope labels" 1 "0" \
-  grep -c 'scope:release-flow\|scope:guards\|scope:labels\|scope:docs' "$ROOT/LABELS.md"
+  grep -c 'scope:[a-z0-9]' "$ROOT/LABELS.md"
 
 summary