feat: support content-hash passage IDs#347
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Add an opt-in content-hash passage ID scheme for stable chunk IDs across rebuilds and file moves. Persist the scheme in metadata, preserve it during incremental updates, and add a migration command that rewrites passage artifacts plus FTS5 BM25 IDs. Cover builder ID generation and migration artifact consistency with focused tests.
This was referenced Jun 2, 2026
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--id-scheme content-hash, records the scheme in metadata, and keeps incremental updates on the existing index scheme.leann migrate-idsto rewrite passage artifacts plus FTS5 BM25 IDs, with focused migration tests.