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>

landing/package.json

@@ -0,0 +1,29 @@
+{
+  "name": "landing",
+  "version": "0.1.0",
+  "private": true,
+  "scripts": {
+    "dev": "next dev",
+    "build": "next build",
+    "build:pages": "npx @cloudflare/next-on-pages",
+    "start": "next start",
+    "deploy": "npm run build:pages && wrangler pages deploy"
+  },
+  "dependencies": {
+    "@cloudflare/next-on-pages": "^1.13.16",
+    "next": "^15.5.15",
+    "react": "^19.2.5",
+    "react-dom": "^19.2.5",
+    "react-markdown": "^10.1.0",
+    "remark-gfm": "^4.0.1",
+    "wrangler": "^4.83.0"
+  },
+  "devDependencies": {
+    "@tailwindcss/postcss": "^4",
+    "@types/node": "^20",
+    "@types/react": "^19",
+    "@types/react-dom": "^19",
+    "tailwindcss": "^4",
+    "typescript": "^5"
+  }
+}