data streams: hh3 upgrade

[dev-dist]

AI summary of changes made for hh3 upgrade:

• Dependencies (package.json)

  • Hardhat: upgraded to 3.0.7 (from 2.x)
  • Ethers: upgraded to 6.13.0 (Hardhat 3 requires ethers v6)
  • Toolbox: changed to @nomicfoundation/[email protected] (Hardhat 3–compatible variant for ethers)
  • Chainlink Contracts: updated to 1.5.0 (the reason for this migration)

• Module System

  • ESM: added "type": "module" in package.json
  • Converted all JavaScript from CommonJS (require/module.exports) to ES modules (import/export)

• Configuration (hardhat.config.js)

  • Uses import statements instead of require
  • Uses export default instead of module.exports
  • Network config includes type: "http" (required by Hardhat 3)

• Solidity

  • Pragma updated to ^0.8.20 in both contracts
  • Added remappings.txt for OpenZeppelin contract version mapping

• Task Files

  • Converted to ESM with ethers v6 APIs (formatEther, waitForDeployment(), updated AbiCoder)
  • Currently commented out in config due to ESM task loading timing issues

• Node.js Requirement

  • Requires Node.js 22+ (documented in README)

[dev-dist]

Flipping this to draft state as i reconsider my approach to migration