v0.3.0: everything connected and measured

A full audit found 25 defects behind 198 passing tests, and all were fixed. Every upgrade now reaches the running system, and thresholds are measured: on 72 public images with the default model, species precision went from 57% to 94% and food from 46% to 92%, at 100% recall.

Also adds batched indexing, optional FAISS, schema migrations, lazy model loading, vie doctor, HTML search reports, and a CI job that runs every real model.

Existing indexes must be rebuilt to benefit: vie index --rebuild. See the audit and the changelog.