arcrun — AI workflow execution engine (clean history)

Self-hosted 開源：WASM 零件 + recipe + cypher-executor，跑在你自己的 Cloudflare。

此為重建的乾淨歷史起點（移除曾誤 commit 的 GCP SA 金鑰，舊歷史保留在
richblack/arcrun 與本地 backup 分支）。含：
- acr init --self-hosted installer（建 KV/R2 + codeload 拉預編譯 wasm + wrangler deploy + seed recipe）
- recipe push 把關（資料外流提醒 + 打通檢查）
- 19 個正當零件預編譯 wasm（claude_api/km_writer/kbdb_upsert_block 排除：違反 DECISIONS §1）
- CLI / cypher-executor / registry / 完整 SDD

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

builtins/package-lock.json

@@ -0,0 +1,49 @@
+{
+  "name": "@inkstone/u6u-builtins-worker",
+  "version": "1.0.0",
+  "lockfileVersion": 3,
+  "requires": true,
+  "packages": {
+    "": {
+      "name": "@inkstone/u6u-builtins-worker",
+      "version": "1.0.0",
+      "dependencies": {
+        "hono": "^4.7.0"
+      },
+      "devDependencies": {
+        "@cloudflare/workers-types": "^4.20250219.0",
+        "typescript": "^5.7.0"
+      }
+    },
+    "node_modules/@cloudflare/workers-types": {
+      "version": "4.20260329.1",
+      "resolved": "https://registry.npmjs.org/@cloudflare/workers-types/-/workers-types-4.20260329.1.tgz",
+      "integrity": "sha512-LxBHrYYI/AZ6OCbUzRqRgg6Rt1qev2KxN2NNd3saye41AO2g52cYvHV+ohts5oPnrIUD7YRjbgN/J3NU7e7m5A==",
+      "dev": true,
+      "license": "MIT OR Apache-2.0"
+    },
+    "node_modules/hono": {
+      "version": "4.12.9",
+      "resolved": "https://registry.npmjs.org/hono/-/hono-4.12.9.tgz",
+      "integrity": "sha512-wy3T8Zm2bsEvxKZM5w21VdHDDcwVS1yUFFY6i8UobSsKfFceT7TOwhbhfKsDyx7tYQlmRM5FLpIuYvNFyjctiA==",
+      "license": "MIT",
+      "engines": {
+        "node": ">=16.9.0"
+      }
+    },
+    "node_modules/typescript": {
+      "version": "5.9.3",
+      "resolved": "https://registry.npmjs.org/typescript/-/typescript-5.9.3.tgz",
+      "integrity": "sha512-jl1vZzPDinLr9eUt3J/t7V6FgNEw9QjvBPdysz9KfQDD41fQrC2Y4vKQdiaUpFT4bXlb1RHhLpp8wtm6M5TgSw==",
+      "dev": true,
+      "license": "Apache-2.0",
+      "bin": {
+        "tsc": "bin/tsc",
+        "tsserver": "bin/tsserver"
+      },
+      "engines": {
+        "node": ">=14.17"
+      }
+    }
+  }
+}