feat(arcrun): implement arcrun MVP — open-source AI workflow engine

Phase 1-5 complete per .agents/specs/u6u-core-mvp/:

**Phase 1 — Cherry-pick & cleanup**
- Create arcrun/ from cypher-executor, credentials, builtins, registry
- Remove 9 InkStone Service Bindings (KBDB, REGISTRY, CLINIC_*, AICEO, MINI_ME)
- Rewrite component-loader: 3-layer (builtin → WASM_BUCKET R2 → error)
- Remove autoPublishMissing.ts, proxy.ts (AICEO), execution-logger.ts (KBDB)
- Clean all KV namespace IDs and InkStone internal URLs from config files

**Phase 2 — contract.yaml completeness**
- Add credentials_required to gmail, google_sheets, telegram, line_notify
- Add config_example to all 21 components with annotated field descriptions

**Phase 3 — Credential injection**
- Add credential-injector.ts: AES-GCM decrypt from CREDENTIALS_KV
- Integrate into GraphExecutor before WASM execution
- Structured errors with repair instructions when credential missing

**Phase 4 — CLI (acr)**
- cli/package.json: arcrun package, bin: acr, deps: commander/js-yaml/chalk/ora
- 8 commands: init, creds push, push, run, validate, parts, list, logs
- Standard mode: writes directly to user's CF KV via CF REST API
- acr init: interactive setup with arcrun.dev API Key registration

**Phase 5 — Open source release prep**
- README.md: 5-minute quickstart, component table, workflow YAML syntax
- CONTRIBUTING.md: TinyGo dev env, component scaffolding, submission flow
- Security audit: no InkStone internal URLs/IDs in committed files
- .gitignore: exclude credentials.yaml, .wrangler, *.wasm

https://claude.ai/code/session_01BnCdSLVH8tUed9VrrPavgT

cli/package.json

@@ -0,0 +1,35 @@
+{
+  "name": "arcrun",
+  "version": "1.0.0",
+  "description": "AI Workflow CLI for arcrun — deploy and run WASM-based AI workflows on Cloudflare",
+  "bin": {
+    "acr": "./dist/index.js"
+  },
+  "main": "./dist/index.js",
+  "type": "module",
+  "scripts": {
+    "build": "tsc",
+    "dev": "tsc --watch",
+    "prepublishOnly": "npm run build"
+  },
+  "dependencies": {
+    "chalk": "^5.3.0",
+    "commander": "^12.0.0",
+    "js-yaml": "^4.1.0",
+    "ora": "^8.0.1"
+  },
+  "devDependencies": {
+    "@types/js-yaml": "^4.0.9",
+    "@types/node": "^20.0.0",
+    "typescript": "^5.4.0"
+  },
+  "engines": {
+    "node": ">=18.0.0"
+  },
+  "keywords": ["cloudflare", "workers", "wasm", "workflow", "ai", "arcrun"],
+  "license": "MIT",
+  "repository": {
+    "type": "git",
+    "url": "https://github.com/arcrun/arcrun.git"
+  }
+}