reembedAll

Re-embed every stored proposition with the currently-configured embedding service.

The default re-saves each proposition, which re-embeds it for any backend that embeds on save; for backends that do not own embeddings (e.g. in-memory) it is a harmless rewrite.

Caveat: a model swap that changes the embedding dimension also needs the backend's vector index recreated at the new dimension — a backend/schema concern this does not perform. For same-dimension re-embeds (the common case) it is sufficient on its own.