chore: ratchet down the role-word baseline for the pruned skill.permissions line

Removing the `permissions` row from the objectstack-ai skill doc dropped its
role-word count 6 -> 5; the ratchet requires the baseline to follow. Only that
one entry changed (verified: no other file was whitewashed by --update).

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

Author: os-zhuang

scripts/role-word-baseline.json

@@ -34,7 +34,7 @@
   "content/docs/releases/v14.mdx": 5,
   "content/docs/releases/v16.mdx": 5,
   "content/docs/ui/forms.mdx": 3,
-  "skills/objectstack-ai/SKILL.md": 6,
+  "skills/objectstack-ai/SKILL.md": 5,
   "skills/objectstack-api/SKILL.md": 1,
   "skills/objectstack-automation/SKILL.md": 1,
   "skills/objectstack-data/SKILL.md": 4,