Remove stale runtime manna file, gitignore vav_pipeline/var/

vav_pipeline/var/manna/today.json was a stale dev provision file
(5 Nisan 5786, expired). It's a runtime artifact, not source.

Added vav_pipeline/var/ to .gitignore to prevent future leaks.

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

.gitignore

@@ -49,3 +49,4 @@ korban_processor/__pycache__/
 Untitled/
 aws-export/
 transcripts/
+vav_pipeline/var/