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/src/actions/execution-evaluator.ts

@@ -0,0 +1,36 @@
+/**
+ * Execution Analytics — 零件執行後的統計記錄
+ *
+ * Phase 1 MVP：stub（不寫入任何外部服務）
+ * Phase 7 補充：fire-and-forget POST 至 registry.arcrun.dev/analytics/record
+ */
+
+import type { Bindings } from '../types';
+
+export interface EvaluationRecord {
+  run_id: string;
+  workflow_id: string;
+  component_id: string;
+  verdict: 'success' | 'failed' | 'timeout';
+  duration_ms: number;
+  error_message?: string;
+  evaluated_at: number;
+}
+
+/** 記錄執行結果（MVP：no-op，Phase 7 補充 analytics）*/
+export async function writeEvaluation(
+  _env: Bindings,
+  _record: EvaluationRecord,
+): Promise<void> {
+  // Phase 7: POST to registry.arcrun.dev/analytics/record
+}
+
+/** 更新零件統計（MVP：no-op，Phase 7 補充）*/
+export async function updateComponentStats(
+  _env: Bindings,
+  _componentId: string,
+  _verdict: 'success' | 'failed' | 'timeout',
+  _durationMs: number,
+): Promise<void> {
+  // Phase 7: update ANALYTICS_KV via registry worker
+}