chore(worker-builds): 重編官方成品——kbdb／cypher-executor 的修法之前只在源碼裡

為什麼要有這一筆：`.worker-builds/` 是**出貨與安裝真正拿去部署的執行檔**，
而它記的 source_commit 在剛併完 #85／#88 之後對不上源碼：

    arcrun-cypher-executor  成品記的 797e7f7  源碼已經是 525faaf  ⚠️
    arcrun-kbdb             成品記的 a7e23ba  源碼已經是 3eb8b31  ⚠️

⇒ 這時候去出貨或 `init`，送出去的是**舊的執行檔**，測試全綠也沒用
（wiki/mistakes.md「修的東西在執行檔裡，改完源碼＋測試綠 ≠ 送到用戶手上」）。

🔴 build-bundles.mjs 的「落後閘」抓不到這個：它比的是「.worker-builds 這個目錄有沒有
落後 main 的 commit」，不是「成品記的 source_commit 有沒有落後那顆 worker 的源碼」。
這次是人工比對才發現的。修這道閘另開票。

重編後：cypher-executor source=525faaf、kbdb source=3eb8b31，兩顆的新程式碼都在產物裡
（kbdb 找得到 embed_backfill_usage／backfillEntryLibraryTags，cypher 找得到 builtin 那條路）。

誠實標記：另外三顆（code／http_request／mcp）源碼沒動，位元組卻變了——是 esbuild
版本漂移換了它產生的 helper（`__esm` 多了一段 try/catch）。這正是 #77 記的
「build 不可跨機器重現」那個結構性斷點的實例。

.worker-builds/manifest.json

@@ -1,18 +1,18 @@
 {
   "schema": 1,
   "built_for": "arcrun-tier2-worker-artifacts",
-  "generated_at": "2026-08-11T05:33:37.988Z",
-  "repo_head": "d8bbf2241bd6b117d76fb27d9e386ecfb0ffe8f7",
+  "generated_at": "2026-08-12T01:50:15.065Z",
+  "repo_head": "3eb8b31f2bfa029e15a8119e229082fbafb8d2b1",
   "repo_dirty": false,
   "workers": [
     {
       "name": "arcrun-cypher-executor",
       "source_dir": "cypher-executor",
-      "source_commit": "797e7f751cc42cb1f5d9e2e187f18cf51eb981a1",
+      "source_commit": "525faaf5d01e156a9b8f90808607bead92f40165",
       "main_module": "worker.mjs",
       "main_file": "arcrun-cypher-executor/worker.mjs",
-      "js_bytes": 568855,
-      "content_sha256": "66e2a6341854e8b2de0567a46282b94669e73b95d152b05b17b0f8b58e257fec",
+      "js_bytes": 570290,
+      "content_sha256": "49d59597c01b5264875e0295c86c7bb2212bf54d3c5858cd4a167752370fa716",
       "modules": [],
       "compat_date": "2025-02-19",
       "compat_flags": [
@@ -58,11 +58,11 @@
     {
       "name": "arcrun-kbdb",
       "source_dir": "kbdb",
-      "source_commit": "a7e23badf2a771be779a861e69e7efa6e8141dfe",
+      "source_commit": "3eb8b31f2bfa029e15a8119e229082fbafb8d2b1",
       "main_module": "worker.mjs",
       "main_file": "arcrun-kbdb/worker.mjs",
-      "js_bytes": 135910,
-      "content_sha256": "5e5a7a030f4fd1f5549ace6791c3827b6497b0bfdd9add46af041af47c472905",
+      "js_bytes": 149234,
+      "content_sha256": "7bc666568f453a2fc5fc9339fc997c12d3927fb8a293439f2c80695be8da9767",
       "modules": [],
       "compat_date": "2025-02-19",
       "compat_flags": [
@@ -90,8 +90,8 @@
       "source_commit": "1e85dfb49b0e8d81c0854781d93ee4e6a300c7b3",
       "main_module": "worker.mjs",
       "main_file": "arcrun-http-request/worker.mjs",
-      "js_bytes": 80073,
-      "content_sha256": "9a9dcb71879a7bdfd9fec1bd94eb9742e12cb63733d822ce63eeb1be30008d15",
+      "js_bytes": 80079,
+      "content_sha256": "cdd97364f277587cbade69e09bb40812c68f26a1e8bc9aa632c65b1b962b0b85",
       "modules": [
         {
           "name": "component.wasm",
@@ -122,8 +122,8 @@
       "source_commit": "621cb8d948d61be6202063fd02effb3f538437fe",
       "main_module": "worker.mjs",
       "main_file": "arcrun-code/worker.mjs",
-      "js_bytes": 153671,
-      "content_sha256": "285a7406ec694ae47dccfaf48517f712c74d207a1689dffa15c39f1555b45be5",
+      "js_bytes": 153758,
+      "content_sha256": "751634a3fc9a99cc2da662026818d754c48f031d10bff3b3be2d3a8ee2311bd6",
       "modules": [
         {
           "name": "quickjs.wasm",
@@ -151,8 +151,8 @@
       "source_commit": "035e8b255b0dcbd4238707f7d2ac8ccf9ee1ba72",
       "main_module": "worker.mjs",
       "main_file": "arcrun-mcp/worker.mjs",
-      "js_bytes": 1165130,
-      "content_sha256": "be15033f32e605f03f69bd10cd87782dafa34dbafeee2ce367bd7361a062a291",
+      "js_bytes": 1165388,
+      "content_sha256": "c5ff10f9b9d5a77217be343af12d2be3ee8f9792d3e1e091e48e5e6c8d24ca9d",
       "modules": [],
       "compat_date": "2024-11-27",
       "compat_flags": [