selftest

One pruned line in the morning build settled it: an unpruned vector index answers with documents that no longer exist, and free-form data is a contract.

TL;DR: Renaming a research file left a stale embedding in a JSON vector index that kept returning a ghost document. The fix added tolerant reading for summary field aliases, automatic pruning of missing files during builds, and a self-testing suite. It is a sixty-line reminder that small local tools need honest indexes and defensive boundaries.