Cryo for Apache Iceberg

Cryo keeps Apache Iceberg tables healthy. It grades every table from A to F using 14 metadata checks, then runs compaction, snapshot expiry and orphan file cleanup on Trino or Spark, only when the engine has spare capacity, so it stays out of the way of live queries and writers. It runs in production at Physics Wallah on about 12,000 Iceberg tables. We benchmarked queries 1.76x faster on average (up to 4.34x), and under a MERGE every 200 seconds Cryo landed 22 of 22 maintenance commits while a scheduled Spark job landed 0 of 3.