chore: remove duplicate credentials/ dir + add CLAUDE.md + .claude rules
credentials/ was a leftover duplicate — all credential routes already live in cypher-executor/src/routes/credentials.ts. Adds the SDD protocol, tech-stack, forbidden-list, component-architecture, and progress rules that guide Phase 1-6 refactors. Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
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# 技術棧硬限制
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## 三層語言對應(絕對不可混用)
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| 層級 | 語言 | 位置 | 職責 |
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|-----|------|------|------|
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| 零件(Component) | **TinyGo 或 AssemblyScript → WASM** | `registry/components/{name}/` | 所有業務邏輯 |
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| 零件 Worker 包裝 | TypeScript(固定模板,不寫業務邏輯) | `.component-builds/{name}/` | WASI shim,stdin/stdout JSON |
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| Orchestration Worker | TypeScript + Hono | `cypher-executor/` | HTTP routing、workflow 執行排程、host functions |
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| CLI | TypeScript + Node.js | `cli/` | `acr` 指令 |
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| Python SDK | Python | `python-sdk/` | HTTP thin wrapper + client 端加密 |
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| JS SDK | TypeScript + Web Crypto | `js-sdk/` | HTTP thin wrapper + client 端加密 |
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| Frontend | React 19 + Vite + Tailwind v4 | `landing/` | Cloudflare Pages |
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## 零件實作規範
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### 只有兩種合法語言
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- **TinyGo**:`tinygo build -target=wasi -o {name}.wasm main.go`
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- **AssemblyScript**:`asc main.ts --target release -o {name}.wasm`
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### I/O 模型
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- **stdin**:JSON input
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- **stdout**:JSON output
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- 不用 HTTP server,不監聽 socket(WASI preview1 沒 socket)
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### Host Functions(零件呼叫外部能力的唯一管道)
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在 `u6u` namespace 下:
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| Host Function | 用途 |
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|---|---|
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| `u6u.http_request` | 發 HTTP 請求 |
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| `u6u.kv_get` | 讀 Cloudflare KV(Worker 側依 key 前綴路由到正確 KV) |
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| `u6u.crypto_decrypt` | AES-GCM 解密(encryption key 永不暴露給 WASM) |
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| `u6u.crypto_sign_rs256` | RSA-SHA256 簽章(PKCS8 bytes 傳入) |
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**所有 host function 在 `cypher-executor/src/lib/wasi-shim.ts` 實作**。零件透過 WASI import 使用。
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## 資料儲存
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| 儲存 | 用途 | Key 格式 |
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|-----|------|---------|
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| Cloudflare KV `WEBHOOKS` | workflow 定義(cypher binding YAML) | `webhook:{api_key}:{name}` |
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| Cloudflare KV `CREDENTIALS_KV` | 加密 credential | `{api_key}:cred:{name}` |
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| Cloudflare KV `RECIPES` | auth recipe / 動態 API recipe | `auth_recipe:{service}`, `rec_{hash}` |
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| Cloudflare KV `USERS_KV` | 用戶資料 | `user:{api_key}` |
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| Cloudflare KV `SESSIONS_KV` | session | `session:{token}` |
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| Cloudflare KV `ANALYTICS_KV` | 執行分析 | `execution:{timestamp}:{id}` |
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| Cloudflare KV `EXEC_CONTEXT` | workflow 執行中的 context | `ctx:{execution_id}:{node_id}` |
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| Cloudflare R2 `WASM_BUCKET` | **只用於用戶自製零件**(Phase 5 以後啟用) | `{api_key}:cmp:{hash}` |
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**警告:R2 不存平台內建零件的 WASM**。平台零件已 bundle 進各自的 Worker binary(`[[wasm_modules]]` 或 `import ... assert { type: 'webassembly' }`)。
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## 加解密規範
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- **演算法**:AES-GCM 256-bit
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- **加密位置**:Client 端(CLI / Python SDK / JS SDK)
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- Python:`cryptography` 套件
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- JS:Web Crypto API(`crypto.subtle`)
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- **解密位置**:Server 端 **WASM primitive**(透過 host function `crypto_decrypt`)
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- cypher-executor TS **不解密**,只提供 host function
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- `ENCRYPTION_KEY` 只在 Worker host function 內部讀取,**永不經 stdin / 回傳值傳給 WASM**
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- **傳輸格式**:`{ name, encrypted, iv }`(iv base64、encrypted base64)
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## 網路部署
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- **平台 API**:`cypher.arcrun.dev`(cypher-executor)
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- **每個零件**:獨立 Worker,URL 慣例 `{component-name-kebab}.arcrun.dev`
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- 例:`auth-static-key.arcrun.dev`、`gmail.arcrun.dev`
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- **Landing**:`arcrun.dev`
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- **部署工具**:Wrangler
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