feat(graph): node gloss→base embeddable entry 橋——Arcrun#7 A1

修「打標≠讀標」：node gloss+embed 標在 entity record、但 base embed 只掃 entries.metadata.embed
→ persistNodes 另落一筆 content=canonical:gloss、metadata.embed=true 的 base entry(走 API/零SQL)。
- gloss-entry.ts: upsertGlossEntry 冪等(確定性 page_name + list-then-write)
- backfill-gloss-entries.ts + route: 對既有 entity record 補 gloss entry
- triplet-ingest 帶 source.uri 進 metadata；kbdb-client 暴露 metadata_json(base 早支援)
- vitest 30/30(+7)；[→arcrun] base 缺 upsert entry 端點,暫以 list-then-write 冪等

tests/mock-client.ts

@@ -16,7 +16,16 @@ export class MockKbdbClient {
 
   async createEntry(input: any): Promise<BaseEntry> {
     const id = this.id('entry');
-    const entry: BaseEntry = { id, content: input.content ?? null, entry_type: input.entry_type, owner_id: input.owner_id ?? null };
+    // 對齊 base entry-crud：保留 page_name（idempotency key）、metadata_json（embed 打標）、parent_id。
+    const entry: BaseEntry = {
+      id,
+      content: input.content ?? null,
+      entry_type: input.entry_type,
+      owner_id: input.owner_id ?? null,
+      parent_id: input.parent_id ?? null,
+      page_name: input.page_name ?? null,
+      metadata_json: input.metadata_json ?? null,
+    };
     this.entries.set(id, entry);
     return entry;
   }
@@ -26,8 +35,13 @@ export class MockKbdbClient {
   }
 
   async listEntries(filters: any = {}): Promise<BaseEntry[]> {
+    // 對齊 base entry-crud listEntries 的 exact-match filters（含 page_name idempotency key、parent_id）。
     return [...this.entries.values()].filter(
-      (e) => (!filters.entry_type || e.entry_type === filters.entry_type) && (!filters.owner_id || e.owner_id === filters.owner_id),
+      (e) =>
+        (!filters.entry_type || e.entry_type === filters.entry_type) &&
+        (!filters.owner_id || e.owner_id === filters.owner_id) &&
+        (!filters.parent_id || e.parent_id === filters.parent_id) &&
+        (!filters.page_name || e.page_name === filters.page_name),
     );
   }