Documents WITHOUT non-deleted memories, narrowed by recovery-status filter.

Backs the passport synthetic-row stream and the UI "uploaded but unindexed" surface. A row appears when it has zero non-deleted memories AND at least one layer status sits in the supplied filter. Filter omitted -> server default 'recovery-relevant set (extraction in pending/failed/unsupported, semantic_index in pending/failed, raw_storage in raw_storage_failed). Cursor + limit semantics match GET /v1/documents.