docs(audit): register the Business Ontology page in the hand-written doc ledger

check:docs-audit-scope reds when a hand-written page exists under
content/docs/ and the ledger does not list it, because a run that calls
itself a full audit would silently skip it. Regenerated with the gate's
own --write.

Claude-Session: https://claude.ai/code/session_011hRnra93sK5Q2gTYYTbdJR
Co-authored-by: Claude <noreply@anthropic.com>

Author: claude

scripts/docs-audit/handwritten-docs.json

@@ -69,6 +69,7 @@
     "content/docs/concepts/metadata-driven.mdx",
     "content/docs/concepts/metadata-lifecycle.mdx",
     "content/docs/concepts/north-star.mdx",
+    "content/docs/concepts/ontology.mdx",
     "content/docs/data-modeling/analytics.mdx",
     "content/docs/data-modeling/drivers.mdx",
     "content/docs/data-modeling/external-datasources.mdx",