[Copilot]

Addresses the safe engineering pilot requirements for Cf-: reproducible install, full test hardening, non-deploying CI validation, dependency/secret scanning, and deployment risk documentation. No production deployment, no mainnet interaction, PR #4 excluded throughout.

Changes

Build / install

• Downgraded Hardhat v3 → v2 (2.29.1); v3 requires ESM and cannot resolve the Solidity compiler CDN in restricted environments
• Installed @nomicfoundation/hardhat-ethers@hh2 and hardhat-chai-matchers@hh2; added solc@0.8.26 and solidity-coverage as devDependencies
• Added an offline-compiler fallback subtask in hardhat.config.js that catches CDN failures and uses the bundled solc package:

subtask(TASK_COMPILE_SOLIDITY_GET_SOLC_BUILD, async (args, hre, runSuper) => {
  try {
    return await runSuper(args);
  } catch (_e) {
    const solcPath = require.resolve("solc/soljson");
    const solc = require("solc");
    const longVersion = solc.version().replace(".Emscripten.clang", "");
    return { version: longVersion.split("+")[0], longVersion, compilerPath: solcPath, isSolcJs: true };
  }
});

Tests (test/ERC20_Token_Sample.invariants.test.js)

21 new tests across five categories (46 total, 100% coverage):

• Supply conservation – transfer sequences, multi-burn, raw ERC20Burnable.burn() path
• Allowance consumption – partial/exact burnFrom, approve overwrite, partial transferFrom
• Zero-value rejection – ZeroBurnAmount on both burnTokens(0) and burnFrom(…, 0)
• Authorization – ERC20InsufficientAllowance on burnFrom/transferFrom without approval
• Burn consistency – dual-event emission; confirms raw burn() does not emit TokensBurned

CI (.github/workflows/test.yml)

Replaced single-step workflow with three jobs — no deployment step anywhere:

Job	What it runs
Compile · Test · Lint · Coverage	hardhat compile/test, solhint, hardhat coverage
Dependency Scan	npm audit --audit-level=critical
Secret Scan	gitleaks/gitleaks-action@v2

Documentation (DEPLOYMENT.md)

New file covering: install prerequisites, pre-deployment checklist, mainnet gate requirements, recipient-wallet controls (multi-sig recommendation), Etherscan verification steps, rollback limitations (contract is fully immutable), and a risk register (R-1–R-7) including the duplicate burn interface question and the known high-severity advisories in Hardhat v2's transitive undici dependency.

• Fixes Pilot: harden ERC-20 project without PR #4 or production deployment #7

[Copilot]

🟡 Changes recommended

Enabling ESM at the package level currently breaks existing CommonJS .js entry points (Hardhat config/tests/scripts) unless they’re also migrated or renamed to .cjs.

Once you've addressed the issues Copilot identified, you can request another Copilot review.

Pull request overview

This PR updates the project’s Node module mode to ESM by setting the package-level module type, which is a prerequisite for ESM-compatible Hardhat configuration/tests in an ERC-20 project setup.

Changes:

• Set "type": "module" in package.json to opt the repo into ESM semantics for .js files.

File summaries

File	Description
package.json	Enables ESM mode at the package level via "type": "module".

Review details

• Files reviewed: 1/1 changed files
• Comments generated: 1
• Review effort level: Lite

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