Merge pull request 'Add AGENTS.md' (#250) from chore/agents.md into master

Reviewed-on: #250

AGENTS.md

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+# AGENTS.md
+
+Guidance for AI agents working on this repository.
+
+## Project overview
+
+`@kredits/contracts` — Solidity smart contracts and a JavaScript (ethers v5)
+wrapper for [Kosmos Kredits](https://wiki.kosmos.org/Kredits), a contribution
+tracking DAO running on EVM chains (primarily RSK). Contributors earn kredits
+for contributions; kredits are withdrawable as ERC20 tokens. All contracts are
+upgradeable via OpenZeppelin hardhat-upgrades proxies.
+
+## Tech stack
+
+- Solidity ^0.8.0 (compiler 0.8.2), OpenZeppelin upgradeable contracts
+- Hardhat (with @openzeppelin/hardhat-upgrades, hardhat-deploy, hardhat-waffle)
+- JavaScript (CommonJS), ethers v5, ipfs-http-client
+- Tests: mocha + chai + @nomicfoundation/hardhat-chai-matchers
+- Lint: solhint (contracts), eslint (JS)
+
+## Repository layout
+
+- `contracts/` — Solidity smart contracts (see "Contracts" below)
+- `lib/` — published JavaScript API wrapper (entry: `lib/kredits.js`)
+  - `lib/contracts/` — one wrapper class per contract, extending `Base`/`Record`
+  - `lib/serializers/` — IPFS JSON serializers (contributor, contribution)
+  - `lib/utils/` — ipfs, pagination, validator, preflight, deprecate, format-kredits
+  - `lib/abis/` — committed ABI JSON (regenerated by `npm run build:json`)
+  - `lib/addresses.json` — chainId → deployed contract addresses
+- `scripts/` — hardhat CLI helpers (create-proxy, seeds, add-/list-*, build-json,
+  upgrade-example, import/, export/)
+- `test/contracts/` — mocha tests (Contributor.js, Contribution.js)
+- `config/seeds.js` — demo seed data
+- `hardhat.config.js` — networks: hardhat (1337), rinkeby, rsk (RSK testnet);
+  injects `hre.kredits` (an initialized `Kredits` instance)
+
+## Contracts
+
+All in `contracts/`, all `Initializable` (OpenZeppelin upgradeable):
+
+- `Contributor.sol` — contributor registry (account + IPFS profile hash).
+  Core team = contributor IDs 1–6 (hardcoded). `withdraw()` mints tokens for
+  confirmed, not-yet-withdrawn kredits.
+- `Contribution.sol` — contribution records (ERC721-like ownership). Veto
+  period ~40320 blocks (~7 days @ 15s blocks). `add()` → veto window → confirmed.
+- `Reimbursement.sol` — expense reimbursements, same veto pattern.
+- `Token.sol` — ERC20 "Kredits" (symbol KS, 0 decimals). `mintFor` callable only
+  by the Contributor contract.
+
+Contracts are independent and reference each other by address (set via
+`setContributorContract`, `setContributionContract`, `setTokenContract`).
+Wiring happens in `scripts/create-proxy.js`.
+
+## Common commands
+
+Bootstrap a local dev environment:
+```
+npm install
+npm run devchain        # hardhat node --network hardhat (separate terminal)
+npm run bootstrap       # build + deploy proxies + seeds (uses localhost)
+```
+
+Other:
+```
+npm run build           # compile contracts + regenerate lib/abis
+npm run deploy:dao      # deploy upgradeable proxies (scripts/create-proxy.js)
+npm run seeds           # seed demo data
+npm run fund            # send devchain ETH to an address
+npm test                # hardhat test (requires devchain running)
+npm run lint:contracts  # solhint
+npm run lint:wrapper    # eslint lib/
+```
+
+Run a hardhat script: `hardhat run scripts/<name>.js --network localhost`
+(or `--network rsk` for RSK testnet). Use `DEPLOY_KEY=<hex>` to override the
+deploy account.
+
+## Conventions
+
+### JavaScript (eslint: `lib/`, scripts/, test/)
+- CommonJS (`require`/`module.exports`)
+- 2-space indentation; semicolons required
+- Trailing commas in multiline arrays/objects (not in imports/exports)
+- Space before named function parens: `function foo () {}`, `async () => {}`
+- Async wrappers use `.then()` chains in older code; new code may use async/await
+
+### Solidity (solhint: default + recommended)
+- `pragma solidity ^0.8.0;`
+- Upgradeable pattern: `import Initializable`, use `initialize()` (and
+  `reinitializer(n)` for upgrades) — never use constructors for state init
+- Interfaces declared inline (e.g. `ContributorInterface`) for cross-contract calls
+- Core-only / deployer-only / contributors-only modifiers guard privileged calls
+
+### Upgradeable contract changes
+- Do not use constructors to initialize state (use `initialize`/`reinitializer`)
+- Do not change the order/types of existing storage variables (storage layout!)
+- New storage vars go at the end of the contract
+- See `scripts/upgrade-example.js` and `scripts/create-proxy.js`
+
+## Tests
+
+Mocha + hardhat-waffle + chai-matchers. `test/contracts/` only covers
+Contributor and Contribution today. When changing contract code, add/adapt
+tests there. Requires a running devchain (`npm run devchain`) for `npm test`.
+
+## Networks & deployment
+
+- `hardhat` (chainId 1337) — local devchain
+- `rsk` (RSK testnet, https://rsk-testnet.kosmos.org) — primary test deployment
+- `rinkeby` — legacy, configured but deprecated
+- Deployed addresses are tracked per chainId in `lib/addresses.json` and must be
+  committed when deployment changes (see `npm run version` script)