docs: add DEVELOPMENT.md contributor setup guide

DEVELOPMENT.md

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+# Development Guide
+
+Quick reference for building and running Pezkuwi SDK locally.
+For full documentation see the [Development Guide wiki](https://gitlab.com/pezkuwichain/pezkuwi-sdk/-/wikis/Development-Guide).
+
+## System Requirements
+
+| Resource | Minimum | Recommended |
+|----------|---------|-------------|
+| CPU | 4 cores | 8+ cores |
+| RAM | 8 GB | 16+ GB |
+| Disk | 50 GB | 100+ GB SSD |
+| OS | Ubuntu 22.04 / macOS 13+ | Ubuntu 24.04 |
+
+### Dependencies (Ubuntu)
+
+```bash
+sudo apt-get install -y \
+  build-essential git clang cmake pkg-config \
+  libssl-dev protobuf-compiler
+```
+
+### Dependencies (macOS)
+
+```bash
+brew install cmake protobuf openssl
+```
+
+## Rust Setup
+
+```bash
+curl --proto '=https' --tlsv1.2 -sSf https://sh.rustup.rs | sh
+rustup target add wasm32-unknown-unknown
+```
+
+> Toolchain version is pinned in `rust-toolchain.toml` (currently 1.88.0).
+> `rustup show` will install it automatically.
+
+## Build
+
+```bash
+# Type-check entire workspace (fast)
+cargo check --workspace --locked
+
+# Build node binary
+cargo build --release -p pezkuwi --locked
+
+# Binaries produced:
+#   target/release/pezkuwi
+#   target/release/pezkuwi-execute-worker
+#   target/release/pezkuwi-prepare-worker
+```
+
+## Run a Local Dev Node
+
+```bash
+./target/release/pezkuwi --dev
+```
+
+## Tests
+
+```bash
+# Unit tests
+cargo test --workspace --lib --locked
+
+# With nextest (parallel, faster)
+cargo nextest run --workspace --locked
+
+# Doc tests
+cargo test --doc --workspace --locked
+```
+
+## Linting
+
+```bash
+cargo fmt --all
+cargo clippy --workspace --all-targets --all-features -- -D warnings
+taplo format --config .config/taplo.toml
+```
+
+## Docs
+
+```bash
+cargo doc --workspace --no-deps --open
+```
+
+## More
+
+- [Architecture](https://gitlab.com/pezkuwichain/pezkuwi-sdk/-/wikis/Architecture)
+- [Custom Pallets](https://gitlab.com/pezkuwichain/pezkuwi-sdk/-/wikis/Custom-Pallets)
+- [Contributing](./CONTRIBUTING.md)
+