feat(evidence): add Qdrant BM25 vector in place

backend/test/workspaces/evidence/preprocessing.test.ts

@@ -40,11 +40,13 @@ function dependencies(payload: Record<string, unknown> = {}): EvidencePreprocess
   runStage: ReturnType<typeof vi.fn>;
   persistJob: ReturnType<typeof vi.fn>;
   semanticPreflight: ReturnType<typeof vi.fn>;
+  evidencePreflight: ReturnType<typeof vi.fn>;
 } {
   return {
     runStage: vi.fn(async () => payload),
     persistJob: vi.fn(),
     semanticPreflight: vi.fn(async () => ({ ok: true as const })),
+    evidencePreflight: vi.fn(async () => ({ ok: true as const })),
     requireRunId(value) {
       if (typeof value !== "string" || !/^[0-9a-f]{32}$/.test(value)) {
         throw new Error("child run id is invalid");
@@ -60,7 +62,7 @@ function dependencies(payload: Record<string, unknown> = {}): EvidencePreprocess
   };
 }
 
-test("owns the standalone Evidence stage argv and mutation order", async () => {
+test("Evidence maintenance preflights the additive BM25 contract before starting its stage", async () => {
   const state = job({ childRuns: { evidence: "b".repeat(32) } });
   const deps = dependencies({ run_id: "c".repeat(32), counts: { added: 2 } });
 
@@ -69,7 +71,8 @@ test("owns the standalone Evidence stage argv and mutation order", async () => {
     deps,
   );
 
-  expect(deps.semanticPreflight).toHaveBeenCalledOnce();
+  expect(deps.evidencePreflight).toHaveBeenCalledOnce();
+  expect(deps.semanticPreflight).not.toHaveBeenCalled();
   expect(deps.runStage).toHaveBeenCalledWith([
     "preprocess", "evidence", "--resume", "b".repeat(32), "--json", "-c", "/dev/fd/3",
   ]);