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>

cypher-executor/wrangler.test.toml

@@ -0,0 +1,23 @@
+name = "arcrun-cypher-executor"
+main = "src/index.ts"
+compatibility_date = "2025-02-19"
+compatibility_flags = ["nodejs_compat"]
+
+# 測試環境不啟用 Service Binding（Miniflare 無法解析外部服務）
+
+# R2 mock（WASM 執行器測試用）
+[[r2_buckets]]
+binding = "WASM_BUCKET"
+bucket_name = "arcrun-wasm"
+
+# KV mock（BUILD-006）
+[[kv_namespaces]]
+binding = "EXEC_CONTEXT"
+id = "test-exec-context"
+
+[[kv_namespaces]]
+binding = "WEBHOOKS"
+id = "test-webhooks"
+
+[vars]
+ENVIRONMENT = "test"