Embedding worker, reindex queue wiring, and search integration. The plugin is single-tenant and currently indexes zero documents for the dev wiki. Needs per-wiki FAISS directories, a queue-based worker triggered by page saves, and MCP/API wiring.
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See [[Tasks/Semantic_Search_Architecture]] and [[Tasks/Semantic_Search_Multi_Tenant]] for the full diagnosis and options.
Multi-tenant FAISS backend via `BackendRegistry` — per-wiki indexes at `/srv/data/faiss/{slug}/`. ChromaDB deprecated and disabled. Sync thread replaced by lifecycle hooks (`page_saved`/`page_deleted`/`page_renamed`). `reindex_all` is per-wiki scoped. Auto-reindex on first wiki access. See [[Tasks/Semantic_Search_Architecture]] and [[Tasks/Semantic_Search_Multi_Tenant]].
### Wiki stats plugin
Track page count and disk usage via otterwiki lifecycle hooks. Enables tier limits and quota enforcement. Design at [[Design/Wiki_Stats_Plugin]]. **Parked — design only.**
