feat(graph): owner_id 寫入鏈必經(根治無主資料)——配合 base owner-mandatory(D28)

- kbdb-client requireOwner 守衛:漏 owner 插件端即 throw,不再靜默送 owner:''
- owner 一路 thread:persistNodes/ingestEnvelope/entity-crud/triplet-crud 全必填
- 病灶修:POST /triplets/ingest 原本沒傳 owner→加 owner_id query+400
- 寫入 route 缺 owner→400;vitest 23→27
- 註:gloss-bridge 分支的 backfill/gloss-entry 另需套 owner 必填(附說明),不跨支疊改

src/actions/triplet-crud.ts

@@ -13,7 +13,7 @@ export type CreateTripletData = {
   object: string;
   source_block_id?: string;
   confidence?: number;
-  owner_id?: string;
+  owner_id: string;  // 必經：三元組寫入必帶 owner（createRecord 內 requireOwner 守衛）
   clusters?: string[];
   bridge_score?: number;
   subject_entity_type?: string;