feat(evidence): add Qdrant BM25 vector in place

backend/src/workspaces/preprocessing-service.ts

@@ -73,6 +73,9 @@ export interface WorkspacePreprocessingServiceDeps {
   semanticPreflight(workspace: WorkspaceDescriptor): Promise<
     { ok: true } | { ok: false; code: "workspace_not_activatable" | "semantic_index_incompatible" }
   >;
+  evidencePreflight(workspace: WorkspaceDescriptor): Promise<
+    { ok: true } | { ok: false; code: "workspace_not_activatable" | "semantic_index_incompatible" }
+  >;
   httpPrivateHostAllowlist?: readonly string[];
 }
 
@@ -410,6 +413,7 @@ export class WorkspacePreprocessingService {
       runStage: async (argv) => await this.runJsonStage(scope.runtime, argv),
       persistJob: () => this.state(scope.runtime.workspaceId).writeJob(scope.job),
       semanticPreflight: async () => await this.deps.semanticPreflight(scope.runtime.workspace),
+      evidencePreflight: async () => await this.deps.evidencePreflight(scope.runtime.workspace),
       requireRunId: (value) => this.requireRunId(value),
       numberRecord: (value) => this.numberRecord(value),
     };