Scoria.Knowledge is the optional knowledge base capability for retrieval, citations, and grounding inside a Phoenix app.

Start with the default runtime first; the default runtime does not require knowledge setup, pgvector bootstrap, retrieval, or grounding. Add this module when your product intentionally needs host-selected source content to support answers and reviewer-visible evidence.

The host app owns the corpus, tenant membership, source truth, and product meaning of retrieved material. Scoria owns tenant-scoped ingestion, retrieval-run evidence, citations, and deterministic grounding checks inside the embedded boundary.

See guides/capabilities/default-runtime.md for the default-first adoption path and guides/reviewer-verification.md for the optional knowledge base verification suite.