Add hy_memory.reembed for switching the embedding model while writes are
paused. Source and target are named explicitly; a space's identity is the
model name plus the width.
- vector_space_names, plan_reembed, reembed_vector_space (resumable,
cancellable at batch boundaries, widths validated before any upsert, target
wins on existing ids, source never written), verify_reembed,
drop_vector_space.
- scan_vector_spaces and diff_spaces for MemHub's startup reconcile of stray
spaces.
- reembed_graph builds a new Kuzu DB at the target width, copies every node
and edge, recomputes Memory/beh/Topic/HierarchyTopic embeddings and rebuilds
the HNSW index; the source graph is opened read-only. verify_graph_reembed
and drop_graph.
EmbedService.embed_batch now chunks to embedder.batch_size (default 64),
honours Retry-After on 429, takes a per-call max_retries, and rejects vectors
whose width differs from embedding_dims.
Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>
alvinfeiandClaude Opus 5.5
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