feat: add justfile with help target

justfile

@@ -0,0 +1,63 @@
+# QuickLendX protocol — justfile
+# Run `just` or `just help` for available recipes.
+
+# List available recipes
+help:
+    @just --list
+
+# ── Contracts ────────────────────────────────────────────────────────────
+
+# Build all Soroban contracts
+build:
+    cargo build --target wasm32-unknown-unknown --release
+
+# Run contract tests
+test:
+    cargo test -p quicklendx-contracts
+
+# Run fuzz tests (quick | standard | extended | thorough)
+fuzz level="standard":
+    ./run_fuzz_tests.sh {{level}}
+
+# Check WASM binary size (256 KB budget)
+check-wasm:
+    ./scripts/check-wasm-size.sh
+
+# Clippy lint (deny warnings)
+clippy:
+    cargo clippy --workspace --all-targets -- -D warnings
+
+# Format all code
+fmt:
+    cargo fmt --all
+
+# Check formatting without writing
+fmt-check:
+    cargo fmt --all -- --check
+
+# ── Frontend ─────────────────────────────────────────────────────────────
+
+# Install frontend dependencies
+frontend-install:
+    cd quicklendx-frontend && npm ci
+
+# Start local dev server
+frontend-dev:
+    cd quicklendx-frontend && npm run dev
+
+# Production build (includes type checks)
+frontend-build:
+    cd quicklendx-frontend && npm run build
+
+# Lint frontend
+frontend-lint:
+    cd quicklendx-frontend && npm run lint
+
+# Type-check frontend
+frontend-typecheck:
+    cd quicklendx-frontend && npx tsc --noEmit
+
+# ── Combined ─────────────────────────────────────────────────────────────
+
+# Run all checks (format, clippy, tests, WASM size, frontend lint + typecheck)
+check: fmt-check clippy test check-wasm frontend-lint frontend-typecheck