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>
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/**
* Magic vars — workflow YAML 內建變數
*
* 對應 LI SDD M2.x improvementfeedback block c47bf70b)。
*
* 任何以 `_` 開頭的變數名都是 reserved(system)。常見:時間、執行 metadata。
* 用於 page_name / file path / URL 等需要時間戳的場景。
*
* 範例 YAML
* page_name: "roadmap-week-{{_iso_week}}" # roadmap-week-2026-W20
* page_name: "log-{{_today}}" # log-2026-05-16
* filename: "snapshot-{{_now_unix}}.json" # snapshot-1778940000123.json
*
* 不違反 §2.2:這是 orchestrator routing 提供的「環境變數」(像 shell 的 $DATE),
* 不涉及 secret / credential / JWT,跟既有 ctx 變數展開同層。
*/
/**
* 算 ISO 8601 週數(W01-W53)。
* 週一為週首,W01 含當年首個週四(ISO 標準)。
* https://en.wikipedia.org/wiki/ISO_week_date
*/
function isoWeekNumber(d: Date): { year: number; week: number } {
const target = new Date(Date.UTC(d.getUTCFullYear(), d.getUTCMonth(), d.getUTCDate()));
const dayNum = (target.getUTCDay() + 6) % 7; // Mon=0
target.setUTCDate(target.getUTCDate() - dayNum + 3);
const firstThursday = new Date(Date.UTC(target.getUTCFullYear(), 0, 4));
const weekNum = 1 + Math.round(
((target.getTime() - firstThursday.getTime()) / 86400000 -
3 + ((firstThursday.getUTCDay() + 6) % 7)) / 7
);
return { year: target.getUTCFullYear(), week: weekNum };
}
function pad2(n: number): string {
return n.toString().padStart(2, '0');
}
/**
* 建立 magic vars。每次 workflow 觸發時呼叫一次,貫穿整個執行。
*
* 設計:UTC 為基準(避免 worker 跨時區誤判)。需要本地時區的場景,
* 用戶可自己組(例如 yaml 寫 `{{_today_utc}}` + 自己處理偏移)。
*/
export function buildMagicVars(now: Date = new Date()): Record<string, string | number> {
const iso = now.toISOString(); // 2026-05-16T09:30:00.123Z
const yyyy = now.getUTCFullYear();
const mm = pad2(now.getUTCMonth() + 1);
const dd = pad2(now.getUTCDate());
const hh = pad2(now.getUTCHours());
const mi = pad2(now.getUTCMinutes());
const ss = pad2(now.getUTCSeconds());
const yesterday = new Date(now.getTime() - 86400000);
const yMm = pad2(yesterday.getUTCMonth() + 1);
const yDd = pad2(yesterday.getUTCDate());
const { year: isoYear, week: isoWeek } = isoWeekNumber(now);
return {
// 日期 / 時間(UTC
_today: `${yyyy}-${mm}-${dd}`, // 2026-05-16
_yesterday: `${yesterday.getUTCFullYear()}-${yMm}-${yDd}`, // 2026-05-15
_now: iso, // ISO 8601
_now_unix: now.getTime(), // unix ms
_now_unix_s: Math.floor(now.getTime() / 1000), // unix sec
// 個別欄位(給 path / page_name 拼)
_year: yyyy,
_month: mm,
_day: dd,
_hour: hh,
_minute: mi,
_second: ss,
// ISO 週(roadmap weekly archive 必備)
_iso_week: `${isoYear}-W${pad2(isoWeek)}`, // 2026-W20
_iso_week_num: isoWeek,
_iso_year: isoYear,
// 簡單時間 slotcron-friendly
_yyyymm: `${yyyy}${mm}`, // 202605
_yyyymmdd: `${yyyy}${mm}${dd}`, // 20260516
// 週幾(0=週日,1=週一 ... 6=週六;ISO 風格在 _iso_weekday
_weekday: now.getUTCDay(),
_iso_weekday: ((now.getUTCDay() + 6) % 7) + 1, // 1=Mon...7=Sun
};
}