feat: add semantic fact search and embeddings

src/core/schema.ts

@@ -3,6 +3,7 @@ export const FACTS_TABLE = 'facts';
 export const FACT_TOPICS_TABLE = 'fact_topics';
 export const TOPIC_RELATIONS_TABLE = 'topic_relations';
 export const TOPIC_ALIASES_TABLE = 'topic_aliases';
+export const FACT_EMBEDDINGS_TABLE = 'fact_embeddings';
 
 export const TOPIC_COLUMNS = [
   'id',
@@ -51,3 +52,13 @@ export const TOPIC_ALIAS_COLUMNS = [
   'created_at',
   'updated_at',
 ] as const;
+
+export const FACT_EMBEDDING_COLUMNS = [
+  'fact_id',
+  'model',
+  'dimensions',
+  'embedding',
+  'content_hash',
+  'created_at',
+  'updated_at',
+] as const;