Recent app-events views vAppLog25/50/100 for cheap latest-N pulls

Elazar token-efficiency ask: standing views SELECT * FROM appEvents ORDER BY createdAt DESC LIMIT N (25/50/100) so agents pull latest N events cheaply. Applied migration venus_vapplog_views (audit-cleared): CREATE 3 views + DROP stale narrower vAppEventsLast25 (zero dependents). Caveats: columns frozen at CREATE (not auto-tracking), latest-N-overall not filterable. Documented venus-commons + COMMENT ON VIEW in-DB.