fix: cross-platform typescript client clean and add contributing guide

CONTRIBUTING.md

@@ -0,0 +1,60 @@
+# contributing to multi-delegator
+
+Thanks for helping improve this project. This document explains how to set up a dev environment, run checks, and open pull requests against [solana-program/multi-delegator](https://github.com/solana-program/multi-delegator).
+
+## before you start
+
+- Read the [README](README.md) for an overview, program id, and project layout.
+- Architecture notes live under [docs/](docs/); start with [ADR-001](docs/001-multi-delegator-architecture.md) if you change on-chain behavior.
+- The program is **not audited**. Treat changes that touch funds or authority as high risk and call them out clearly in your PR.
+
+## fork and clone
+
+Fork the repository on GitHub, then clone your fork and add the upstream remote:
+
+```bash
+git clone https://github.com/<your-username>/multi-delegator.git
+cd multi-delegator
+git remote add upstream https://github.com/solana-program/multi-delegator.git
+```
+
+Keep your `main` branch tracking `upstream/main`, and use a feature branch for changes:
+
+```bash
+git fetch upstream
+git checkout -b your-branch-name upstream/main
+```
+
+## prerequisites
+
+The [README prerequisites](README.md#prerequisites) list the toolchain: Rust, Solana CLI, pnpm, Just, and Surfpool (for integration tests and local flows).
+
+Run `just setup` once after cloning to install Node dependencies and configure git hooks.
+
+## build and test
+
+Typical workflow:
+
+| Task | Command |
+|------|---------|
+| Build program + idl + clients | `just build` |
+| Program tests only | `just test-program` |
+| Full suite (program + TS client integration tests) | `just test` |
+| Format + lint (same as CI) | `just check` |
+
+Fix formatting before pushing if `just check` fails: `just fmt` and `just lint` (see [justfile](justfile)).
+
+## generated code
+
+IDL and Codama-generated clients under `programs/multi_delegator/idl/`, `clients/typescript/src/generated/`, and `clients/rust/src/generated/` are produced by the build. If you change the on-chain program, run `just build` (or `just generate-idl` / `just generate-client` as appropriate) and commit the regenerated artifacts so CI stays green.
+
+## pull requests
+
+- Open PRs against `solana-program/multi-delegator` `main` from your fork.
+- Describe what changed and why; link related issues if any.
+- Ensure `just check` and `just test` pass locally when your change touches code they cover.
+
+## community
+
+- Use [GitHub issues](https://github.com/solana-program/multi-delegator/issues) for bugs and feature ideas.
+- For security-sensitive reports, use the contact options the maintainers prefer (see repository README or security policy if present).

README.md

@@ -271,6 +271,10 @@ The GitHub Actions workflow (`.github/workflows/ci.yml`) runs on PRs and pushes
 | **integration-test** | Start Surfpool, run TypeScript integration tests |
 | **benchmark** | (PRs only) Generate CU report and post as PR comment |
 
+## Contributing
+
+See [CONTRIBUTING.md](CONTRIBUTING.md) for fork workflow, tests, and pull request expectations.
+
 ## Architecture Docs
 
 | Document | Description |

clients/typescript/package.json

@@ -15,7 +15,7 @@
   "scripts": {
     "build": "tsup",
     "test": "vitest run --config vitest.config.ts",
-    "clean": "rm -rf dist && rm -rf src/generated",
+    "clean": "node ./scripts/clean.mjs",
     "format": "biome check --write",
     "format:check": "biome check",
     "lint": "biome lint --write",

clients/typescript/scripts/clean.mjs

@@ -0,0 +1,8 @@
+import { rmSync } from 'node:fs';
+import { fileURLToPath } from 'node:url';
+import { dirname, join } from 'node:path';
+
+const root = dirname(fileURLToPath(import.meta.url));
+
+rmSync(join(root, '..', 'dist'), { recursive: true, force: true });
+rmSync(join(root, '..', 'src', 'generated'), { recursive: true, force: true });