Situational awareness and health checks for a Tesseract Collection or active Shard: Shard definitions, shared index status, scoped sync breakdown, local clusters and Topics, Doctor and computed-field diagnostics, and orphans. Use when starting work in a vault or sub-collection, when the app shows stale/unindexed files, Lookup/Rollup errors, or other failures, or when asked how healthy a Collection or Shard is.
