- vector: increment embedding_revision whenever delete_embedding is
called so the HNSW cache is invalidated after image/folder deletions,
not just after inserts
- hnsw_index: fix race in build_index — read the revision before
fetching embeddings and again after the parallel_insert; retry the
whole build if the revision advanced during construction, ensuring
the cached index always reflects a consistent snapshot
- commands: replace the fixed 4× over-fetch in semantic_search_images
with a progressive doubling loop; start at exactly `limit` candidates
and double the batch (capped at 8192) until the page is filled or the
vector table is exhausted, preventing both under- and over-fetching
LyAhn
ae3d6e1034