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: "switch"
+display_name: "條件路由"
+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: [value, cases]
+  properties:
+    value:
+      type: string
+      description: 要比對的值
+    cases:
+      type: array
+      items:
+        type: object
+        properties:
+          match:
+            type: string
+          branch:
+            type: string
+    default_branch:
+      type: string
+      description: 無匹配時的預設分支
+output_schema:
+  type: object
+  properties:
+    success:
+      type: boolean
+    data:
+      type: object
+      properties:
+        branch:
+          type: string
+gherkin_tests:
+  - scenario: "匹配到 case"
+    given: '{"value":"a","cases":[{"match":"a","branch":"branch_a"}],"default_branch":"default"}'
+    then_contains: '"branch":"branch_a"'
+  - scenario: "走 default 分支"
+    given: '{"value":"z","cases":[{"match":"a","branch":"branch_a"}],"default_branch":"fallback"}'
+    then_contains: '"branch":"fallback"'
+  - scenario: "無效 JSON"
+    given: 'not-json'
+    then_contains: '{"success":false'
+tags: [builtin, switch, branch, route, condition]
+description: "依值路由到對應分支，支援多個 case 和 default 分支。"
+config_example: |
+  my_switch:                          # 節點名稱（可自訂）
+    value: "{{upstream.status}}"      # 要比對的值（必填）
+    cases:                            # case 清單（必填）
+      - match: active                 # 比對值
+        branch: branch_active         # 對應分支名稱
+      - match: inactive
+        branch: branch_inactive
+    default_branch: branch_default    # 無匹配時的預設分支（選填）