feat: add pluggable fact extraction pipeline

src/ingestion/types.ts

@@ -0,0 +1,18 @@
+import type { AddFactInput, TopicLinkInput } from '../types/api';
+
+export interface ExtractedFact {
+  statement?: string;
+  summary?: string | null;
+  source?: string | null;
+  confidence?: number | null;
+  metadata?: AddFactInput['metadata'];
+  topics: TopicLinkInput[];
+}
+
+export interface FactExtractor {
+  extract(input: string): Promise<ExtractedFact>;
+}
+
+export interface IngestStatementOptions {
+  extractor: FactExtractor;
+}