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>
2026-06-03 15:52:38 +08:00
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+canonical_id: "foreach_control"
+display_name: "迴圈控制"
+category: "logic"
+version: "v1"
+wasi_target: "preview1"
+stability: "floating"
+runtime_compat:
+  - "cf-workers"
+  - "workerd"
+  - "wazero"
+constraints:
+  max_size_kb: 2048
+  max_cold_start_ms: 50
+  no_network_syscall: true
+  no_filesystem_syscall: true
+  io_model: "stdin_stdout_json"
+input_schema:
+  type: object
+  required: [items]
+  properties:
+    items:
+      type: array
+      description: 要迭代的陣列
+    item_key:
+      type: string
+      description: 每個元素注入的變數名，預設 item
+output_schema:
+  type: object
+  properties:
+    success:
+      type: boolean
+    data:
+      type: object
+      properties:
+        items:
+          type: array
+        count:
+          type: number
+        current_index:
+          type: number
+        current_item: {}
+        item_key:
+          type: string
+gherkin_tests:
+  - scenario: "正常迭代"
+    given: '{"items":[1,2,3],"item_key":"item"}'
+    then_contains: '"current_index":0'
+  - scenario: "空陣列"
+    given: '{"items":[]}'
+    then_contains: '{"success":false'
+tags: [builtin, control, foreach, loop, iteration]
+description: "輸出第一個元素供 Cypher Executor 迭代，current_index 從 0 開始。"
+config_example: |
+  my_loop:                         # 節點名稱（可自訂）
+    items: "{{upstream.results}}"  # 要迭代的陣列（必填）
+    item_key: item                 # 每個元素注入的變數名，預設 item（選填）