chore: add Dolt database files to gitignore

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: sjarmak

.gitignore

@@ -80,3 +80,7 @@ oracle_curation_log.json
 
 # Private outreach docs (not for public repo)
 docs/outreach/
+
+# Dolt database files (added by bd init)
+.dolt/
+*.db