feat(ingest): POST /triplets/ingest 寫入端 + deprecate-then-append (T3.2-3.5)

對應 issue #1 T3 B 段。

- templates: TRIPLET_SLOTS 加 status/superseded_by/source_uri/content_hash；
  ENTITY_SLOTS 加 gloss；recordToTriplet 映射新欄位（缺省 status=active 相容舊資料）
- kbdb-client: ensureTemplate 改 slot-diff 補丁（既有 template 走 PATCH /templates/:id
  補缺 slot，取代 early-return → 免遷移腳本）；新增 updateRecord（PATCH /records/:id）
- triplet-ingest action（88 行純函式）：Zod strict 鏡射 ingest-candidate 契約 →
  idempotency（uri+hash 同→no-op）→ 先 append 後 deprecate（無「全無 active」空窗）
- POST /triplets/ingest route：strict 驗證失敗 → 422（禁送 graph 領域欄位）
- queryTriplets 預設 active-only（traverse/search/neighbors 皆經此），
  includeDeprecated opt-out 供 rollback/考古
- 6 測試案全綠（vitest 16 passed）；mock-client 同步 slot-diff + updateRecord

gates: zero SQL / zero migration / 無 D1·Vectorize·AI 綁定 / dry-run bundle 乾淨

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

tests/mock-client.ts

@@ -50,12 +50,19 @@ export class MockKbdbClient {
   }
 
   async ensureTemplate(name: string, slots: string[]): Promise<void> {
-    if (!this.templates.has(name)) this.templates.set(name, slots);
+    // 對齊真 client 的 slot-diff 行為：既有 template 補缺 slot（不 early-return）。
+    const have = this.templates.get(name);
+    if (!have) {
+      this.templates.set(name, [...slots]);
+      return;
+    }
+    const set = new Set(have);
+    for (const s of slots) if (!set.has(s)) have.push(s);
   }
 
   async createRecord(template: string, values: Record<string, string>, owner_id?: string): Promise<string> {
     const id = this.id('rec');
-    this.records.set(id, { template, values, owner_id });
+    this.records.set(id, { template, values: { ...values }, owner_id });
     return id;
   }
 
@@ -65,6 +72,11 @@ export class MockKbdbClient {
     return { record_id: recordId, template: r.template, values: r.values };
   }
 
+  async updateRecord(recordId: string, values: Record<string, string>): Promise<void> {
+    const r = this.records.get(recordId);
+    if (r) Object.assign(r.values, values);
+  }
+
   async listRecordsByTemplate(template: string, owner_id?: string): Promise<BaseRecord[]> {
     return [...this.records.entries()]
       .filter(([, r]) => r.template === template && (!owner_id || r.owner_id === owner_id))