feat(co-build): new CoBuild package

.changeset/empty-schools-return.md

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+---
+"@ckb-ccc/core": patch
+---
+
+fix(core): occupy witness while adding output
+

.changeset/odd-experts-win.md

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+---
+"@ckb-ccc/co-build": minor
+---
+
+feat(co-build): new CoBuild package
+

packages/co-build/.npmignore

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+node_modules/
+misc/
+
+*test.js
+*test.ts
+*test.d.ts
+*test.d.ts.map
+*spec.js
+*spec.ts
+*spec.d.ts
+*spec.d.ts.map
+
+tsconfig.json
+tsconfig.*.json
+eslint.config.mjs
+.prettierrc
+.prettierignore
+
+tsconfig.tsbuildinfo
+tsconfig.*.tsbuildinfo
+.github/

packages/co-build/.prettierignore

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+node_modules/
+
+dist/
+dist.commonjs/
+
+.npmignore
+.prettierrc
+tsconfig.json
+eslint.config.mjs
+prettier.config.*
+
+tsconfig.tsbuildinfo
+.github/
+
+CHANGELOG.md

packages/co-build/README.md

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+<p align="center">
+  <a href="https://app.ckbccc.com/">
+    <img alt="Logo" src="https://raw.githubusercontent.com/ckb-devrel/ccc/master/assets/logoAndText.svg" style="height: 8rem; max-width: 90%; padding: 0.5rem 0;" />
+  </a>
+</p>
+
+<h1 align="center" style="font-size: 48px;">
+  @ckb-ccc/co-build
+</h1>
+
+<p align="center">
+  CCC - CKBers' Codebase is a one-stop solution for your CKB JS/TS ecosystem development.
+</p>
+
+## Overview
+
+`@ckb-ccc/co-build` provides tools and Molecule codecs to support the CKB Co-build Protocol, a standard for coordinating multi-party signers and complex script operations (such as Spore actions) within a single transaction.
+
+## Quick Example
+
+```typescript
+import { ccc } from "@ckb-ccc/core";
+import { CoBuild, ScriptInfo } from "@ckb-ccc/co-build";
+
+const coBuild = new CoBuild(
+  {
+    codeHash: "0x...",
+    hashType: "type",
+    args: "0x...",
+  },
+  {
+    name: "MyScript",
+    url: "https://example.com",
+    schema: "MySchema",
+    messageType: "MyMessageType",
+  },
+);
+
+// Build action
+const action = coBuild.buildAction(ccc.bytesFrom("action payload"));
+
+// Append to transaction
+const { tx } = await coBuild.appendActions(transaction, action);
+```

packages/co-build/eslint.config.mjs

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+// @ts-check
+
+import eslint from "@eslint/js";
+import eslintPluginPrettierRecommended from "eslint-plugin-prettier/recommended";
+import tseslint from "typescript-eslint";
+
+import { dirname } from "path";
+import { fileURLToPath } from "url";
+
+export default [
+  ...tseslint.config({
+    files: ["**/*.ts"],
+    extends: [
+      eslint.configs.recommended,
+      ...tseslint.configs.recommendedTypeChecked,
+    ],
+    rules: {
+      "@typescript-eslint/no-unused-vars": [
+        "error",
+        {
+          args: "all",
+          argsIgnorePattern: "^_",
+          caughtErrors: "all",
+          caughtErrorsIgnorePattern: "^_",
+          destructuredArrayIgnorePattern: "^_",
+          varsIgnorePattern: "^_",
+          ignoreRestSiblings: true,
+        },
+      ],
+      "@typescript-eslint/unbound-method": ["error", { ignoreStatic: true }],
+      "@typescript-eslint/no-unsafe-member-access": "off",
+      "@typescript-eslint/require-await": "off",
+      "@typescript-eslint/only-throw-error": [
+        "error",
+        {
+          allowThrowingAny: true,
+          allowThrowingUnknown: true,
+          allowRethrowing: true,
+        },
+      ],
+      "@typescript-eslint/prefer-promise-reject-errors": [
+        "error",
+        {
+          allowThrowingAny: true,
+          allowThrowingUnknown: true,
+        },
+      ],
+      "no-empty": "off",
+      "prefer-const": [
+        "error",
+        { ignoreReadBeforeAssign: true, destructuring: "all" },
+      ],
+    },
+    languageOptions: {
+      parserOptions: {
+        project: true,
+        tsconfigRootDir: dirname(fileURLToPath(import.meta.url)),
+      },
+    },
+  }),
+  eslintPluginPrettierRecommended,
+];

packages/co-build/misc/basedirs/dist.commonjs/package.json

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+{
+  "type": "commonjs"
+}

packages/co-build/misc/basedirs/dist/package.json

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+{
+  "type": "module"
+}

packages/co-build/package.json

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+{
+  "name": "@ckb-ccc/co-build",
+  "version": "0.0.0",
+  "description": "CoBuild",
+  "author": "Hanssen <0@hanssen0.com>",
+  "license": "MIT",
+  "private": false,
+  "homepage": "https://github.com/ckb-devrel/ccc",
+  "repository": {
+    "type": "git",
+    "url": "git://github.com/ckb-devrel/ccc.git"
+  },
+  "main": "./dist.commonjs/index.js",
+  "module": "./dist/index.mjs",
+  "exports": {
+    ".": {
+      "import": "./dist/index.mjs",
+      "require": "./dist.commonjs/index.js"
+    },
+    "./barrel": {
+      "import": "./dist/barrel.mjs",
+      "require": "./dist.commonjs/barrel.js"
+    },
+    "./package.json": "./package.json"
+  },
+  "scripts": {
+    "test": "vitest",
+    "test:ci": "vitest run",
+    "build": "tsdown",
+    "lint": "tsc --noEmit && eslint ./src",
+    "format": "prettier --write . && eslint --fix ./src"
+  },
+  "devDependencies": {
+    "@eslint/js": "^10.0.1",
+    "@types/node": "^26.0.0",
+    "eslint": "^10.5.0",
+    "eslint-config-prettier": "^10.1.8",
+    "eslint-plugin-prettier": "^5.5.6",
+    "prettier": "^3.8.4",
+    "prettier-plugin-organize-imports": "^4.3.0",
+    "tsdown": "^0.22.3",
+    "typescript": "^6.0.3",
+    "typescript-eslint": "^8.61.1",
+    "vitest": "^4.1.9"
+  },
+  "publishConfig": {
+    "access": "public"
+  },
+  "dependencies": {
+    "@ckb-ccc/core": "workspace:*"
+  },
+  "packageManager": "pnpm@11.8.0",
+  "types": "./dist.commonjs/index.d.ts"
+}

packages/co-build/prettier.config.cjs

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+/**
+ * @see https://prettier.io/docs/configuration
+ * @type {import("prettier").Config}
+ */
+const config = {
+  singleQuote: false,
+  trailingComma: "all",
+  plugins: [require.resolve("prettier-plugin-organize-imports")],
+};
+
+module.exports = config;

packages/co-build/src/barrel.ts

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+export * from "./coBuild.js";
+export * from "./codec/index.js";