Why: EXT-8 closure needs the vector channel shared (not just fulltext), the /host/v1 knowledge face honoring the authorizer, and citation-ref-to-artifact consistency pinned as an acceptance test.
Evidence: TestRetrieveSharedVectorChannel (hash embedder: authorized shared vector hit retrievable, denied yields zero), TestSharedSearchFace (hostapi switches to SharedSearch when wired), TestSharedCitationRefDownloadable (shared hit -> Ref -> artifact content download for the authorized member); go test ./... 32/32 packages ok.
Impact: store.SearchKnowledgeVectorsShared; rag.Pipeline.RetrieveShared (own + shared fulltext + shared vector, RRF-merged); server searchKnowledge prefers RetrieveShared when the retriever implements it; hostapi Server.SharedSearch wired in the composition root through the same authorizer slot. Default behavior unchanged.
Refs: EXT-8 proposal acceptance; slices 1-2.
Why: Downstream products must extend the base through a public package and host API instead of editing internal code.
Evidence: go test ./... passed, including plugin v2 assets, sidecar startup, migration v13, pending confirms, HITL timeout, hash embedder, command pairs, and the extension surface snapshot.
Impact: apiVersion 2.0-experimental rejects empty network allowlists for declarative HTTP. Hash embeddings stay opt-in via models.embedding.provider=hash. Plugin secrets resolve per owner at execution time.
Refs: docs/proposals/2026-10-01-plugin-contract-v2.md
Co-authored-by: Cursor <cursoragent@cursor.com>
weichen
