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>

registry/components/array_ops/main.go

@@ -0,0 +1,205 @@
+// array_ops — 陣列操作
+// 支援: count, first, last, reverse, sum, average, min, max, sort, unique
+// input 陣列元素支援 float64 或 string
+//
+//go:build tinygo
+
+package main
+
+import (
+	"encoding/json"
+	"io"
+	"math"
+	"os"
+	"sort"
+	"strconv"
+)
+
+type Input struct {
+	Operation string            `json:"operation"`
+	Input     []json.RawMessage `json:"input"`
+	Args      map[string]string `json:"args"`
+}
+
+func main() {
+	raw, err := io.ReadAll(os.Stdin)
+	if err != nil {
+		writeError("failed to read stdin: " + err.Error())
+		return
+	}
+	var input Input
+	if err := json.Unmarshal(raw, &input); err != nil {
+		writeError("invalid input JSON: " + err.Error())
+		return
+	}
+	if input.Operation == "" {
+		writeError("operation 必填")
+		return
+	}
+
+	items := input.Input
+	op := input.Operation
+
+	switch op {
+	case "count":
+		writeResult(op, len(items))
+	case "first":
+		if len(items) == 0 {
+			writeError("陣列為空")
+			return
+		}
+		writeResultRaw(op, items[0])
+	case "last":
+		if len(items) == 0 {
+			writeError("陣列為空")
+			return
+		}
+		writeResultRaw(op, items[len(items)-1])
+	case "reverse":
+		reversed := make([]json.RawMessage, len(items))
+		for i, v := range items {
+			reversed[len(items)-1-i] = v
+		}
+		writeResultRaw(op, reversed)
+	case "sum":
+		nums, err := toFloats(items)
+		if err != nil {
+			writeError(err.Error())
+			return
+		}
+		sum := 0.0
+		for _, n := range nums {
+			sum += n
+		}
+		writeResult(op, sum)
+	case "average":
+		nums, err := toFloats(items)
+		if err != nil {
+			writeError(err.Error())
+			return
+		}
+		if len(nums) == 0 {
+			writeError("陣列為空")
+			return
+		}
+		sum := 0.0
+		for _, n := range nums {
+			sum += n
+		}
+		writeResult(op, sum/float64(len(nums)))
+	case "min":
+		nums, err := toFloats(items)
+		if err != nil {
+			writeError(err.Error())
+			return
+		}
+		if len(nums) == 0 {
+			writeError("陣列為空")
+			return
+		}
+		m := math.MaxFloat64
+		for _, n := range nums {
+			if n < m {
+				m = n
+			}
+		}
+		writeResult(op, m)
+	case "max":
+		nums, err := toFloats(items)
+		if err != nil {
+			writeError(err.Error())
+			return
+		}
+		if len(nums) == 0 {
+			writeError("陣列為空")
+			return
+		}
+		m := -math.MaxFloat64
+		for _, n := range nums {
+			if n > m {
+				m = n
+			}
+		}
+		writeResult(op, m)
+	case "sort":
+		// 嘗試數字排序，失敗則字串排序
+		nums, err := toFloats(items)
+		if err == nil {
+			sort.Float64s(nums)
+			writeResult(op, nums)
+			return
+		}
+		strs, err2 := toStrings(items)
+		if err2 != nil {
+			writeError("sort 只支援數字或字串陣列")
+			return
+		}
+		sort.Strings(strs)
+		writeResult(op, strs)
+	case "unique":
+		seen := map[string]bool{}
+		var result []json.RawMessage
+		for _, item := range items {
+			key := string(item)
+			if !seen[key] {
+				seen[key] = true
+				result = append(result, item)
+			}
+		}
+		if result == nil {
+			result = []json.RawMessage{}
+		}
+		writeResultRaw(op, result)
+	default:
+		writeError("不支援的 operation: " + op)
+	}
+}
+
+func toFloats(items []json.RawMessage) ([]float64, error) {
+	nums := make([]float64, len(items))
+	for i, item := range items {
+		var n float64
+		if err := json.Unmarshal(item, &n); err != nil {
+			return nil, &parseError{"元素 " + strconv.Itoa(i) + " 不是數字"}
+		}
+		nums[i] = n
+	}
+	return nums, nil
+}
+
+func toStrings(items []json.RawMessage) ([]string, error) {
+	strs := make([]string, len(items))
+	for i, item := range items {
+		var s string
+		if err := json.Unmarshal(item, &s); err != nil {
+			return nil, &parseError{"元素 " + strconv.Itoa(i) + " 不是字串"}
+		}
+		strs[i] = s
+	}
+	return strs, nil
+}
+
+type parseError struct{ msg string }
+
+func (e *parseError) Error() string { return e.msg }
+
+func writeResult(op string, result interface{}) {
+	out, _ := json.Marshal(map[string]interface{}{
+		"success": true,
+		"data":    map[string]interface{}{"result": result, "operation": op},
+	})
+	os.Stdout.Write(out)
+}
+
+func writeResultRaw(op string, result interface{}) {
+	out, _ := json.Marshal(map[string]interface{}{
+		"success": true,
+		"data":    map[string]interface{}{"result": result, "operation": op},
+	})
+	os.Stdout.Write(out)
+}
+
+func writeError(msg string) {
+	out, _ := json.Marshal(map[string]interface{}{"success": false, "error": msg})
+	os.Stdout.Write(out)
+}