Merge branch 'feat/step4-node-substitution' into feat/step3-missing-guidance

# Conflicts:
#	system-dev/docs/3-specs/workflow-discovery/tasks.md

cypher-executor/src/routes/webhooks-named.ts

@@ -30,6 +30,7 @@ import type { GraphNode } from '../types';
 import { extractCronExpr } from '../lib/cron-match';
 import { updateCronIndexEntry, CRON_INDEX_KEY } from '../lib/cron-index';
 import { recordTelemetry } from '../lib/telemetry';
+import { fetchTenantWorkflowSearch } from '../lib/workflow-search';
 
 export const webhooksNamedRouter = new Hono<{ Bindings: Bindings }>();
 
@@ -177,16 +178,9 @@ webhooksNamedRouter.get('/workflows/search', async (c) => {
   // 預設優先語意；caller 傳 mode=keyword 才強制關鍵字。KBDB 端未開 Vectorize 會自動降級。
   const mode = c.req.query('mode') === 'keyword' ? 'keyword' : 'semantic';
 
-  const base = (c.env.KBDB_BASE_URL ?? 'https://arcrun-kbdb.uncle6-me.workers.dev').replace(/\/$/, '');
-  const headers: Record<string, string> = { 'Content-Type': 'application/json' };
-  if (c.env.KBDB_INTERNAL_TOKEN) headers['Authorization'] = `Bearer ${c.env.KBDB_INTERNAL_TOKEN}`;
-  const params = new URLSearchParams({
-    q,
-    owner_id: apiKey,          // 租戶隔離（只搜本租戶的 workflow）
-    entry_type: 'workflow',    // base 通用 filter（Q4），只回 workflow entry
-    mode,
-  });
-  const res = await fetch(`${base}/entries/search?${params.toString()}`, { headers });
+  // KBDB 轉發抽到 lib/workflow-search.ts（t159 target 參數）：本路由與
+  // POST /cypher/search { target:"workflow" } 共用同一條路，行為必然一致。
+  const res = await fetchTenantWorkflowSearch(c.env, apiKey, q, mode);
   return new Response(res.body, { status: res.status, headers: { 'Content-Type': 'application/json' } });
 });