chore: ignore video/ folder

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

Author: aborruso

.gitignore

@@ -27,3 +27,6 @@ tmp.md
 
 # Reference material (e.g. third-party manuals, not for redistribution)
 ref/
+
+# Local video material
+video/