ci: use predicate-quantifier 'every' for paths-filter

With the default 'some', a file only needs to match any one pattern,
so `**` matches everything and `!**/*.md` has no effect. With 'every',
a file must match all patterns, making the markdown exclusion work.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: Boshen

.github/workflows/ci.yml

@@ -48,6 +48,7 @@ jobs:
       - uses: dorny/paths-filter@de90cc6fb38fc0963ad72b210f1f284cd68cea36 # v3.0.2
         id: filter
         with:
+          predicate-quantifier: 'every'
           filters: |
             code:
               - '**'