feat(evidence): add Qdrant BM25 vector in place

backend/test/workspace-preprocessing-service.test.ts

@@ -161,6 +161,7 @@ function fixture(workspace = baseWorkspace) {
     runChild,
     listSessions: async () => [],
     semanticPreflight: async () => ({ ok: true }),
+    evidencePreflight: async () => ({ ok: true }),
   });
   return { dataRoot, runChild, requests, service };
 }
@@ -283,6 +284,7 @@ test("index schema fails closed when semantic preflight refuses the collection",
     runChild,
     listSessions: async () => [],
     semanticPreflight: async () => ({ ok: false, code: "semantic_index_incompatible" }),
+    evidencePreflight: async () => ({ ok: true }),
   });
 
   const result = await service.indexSchema({ workspaceId: "psd-clinical" });
@@ -309,6 +311,7 @@ test("filesystem Evidence proceeds after materialization and private HTTP hosts
     runChild: vi.fn(),
     listSessions: async () => [],
     semanticPreflight: async () => ({ ok: true }),
+    evidencePreflight: async () => ({ ok: true }),
     httpPrivateHostAllowlist: ["metadata.internal"],
   });
 
@@ -513,6 +516,7 @@ test("vector rebuild recreates the full collection contract including keyword in
     runChild: vi.fn(),
     listSessions: async () => [],
     semanticPreflight: async () => ({ ok: true }),
+    evidencePreflight: async () => ({ ok: true }),
   });
   // replace global fetch used by vectorRebuild/reconcileCollection
   const original = globalThis.fetch;