Update readme, justfile and .gitignore

justfile

@@ -1,36 +1,58 @@
-build:
-    pnpm tauri build
+tauri_path := "src-tauri"
 
+# Launch the desktop app with hot reload
+[group('dev')]
 dev:
     pnpm tauri dev
 
-tauri_path := "src-tauri"
+# Produce a release bundle
+[group('dev')]
+build:
+    pnpm tauri build
 
+# Run the Rust unit tests
+[group('test')]
+test:
+    cd {{tauri_path}} && cargo test --lib -- --test-threads=1
+
+# Run the end-to-end solver tests
+[group('test')]
+test-integration:
+    cd {{tauri_path}} && cargo test --test integration -- --test-threads=1 --nocapture
+
+# Run the full suite in release mode
+[group('test')]
+test-all:
+    cd {{tauri_path}} && cargo test --release
+
+# Benchmark the parallel search (criterion)
+[group('test')]
+bench:
+    cd {{tauri_path}} && cargo bench
+
+# Measure coverage via cargo-llvm-cov
+[group('test')]
+cov:
+    cd {{tauri_path}} && cargo llvm-cov run
+
+# Run mutation testing via cargo-mutants
+[group('test')]
+mutants:
+    cd {{tauri_path}} && cargo mutants
+
+# Format frontend (prettier) + backend (cargo fmt)
+[group('quality')]
 fmt:
     pnpm prettier --write "**/*.svelte" "**/*.ts"
     cd {{tauri_path}} && cargo fmt
 
+# Lint the backend (cargo clippy)
+[group('quality')]
 lint:
     cd {{tauri_path}} && cargo clippy
 
-test:
-    cd {{tauri_path}} && cargo test --lib -- --test-threads=1
-
-test-integration:
-    cd {{tauri_path}} && cargo test --test integration -- --test-threads=1 --nocapture
-
-test-all:
-    cd {{tauri_path}} && cargo test --release
-
-bench:
-    cd {{tauri_path}} && cargo bench
-
-cov:
-    cd {{tauri_path}} && cargo llvm-cov run
-
-mutants:
-    cd {{tauri_path}} && cargo mutants
-
+# Remove node_modules and cargo build artifacts
+[group('misc')]
 clean:
     rm -rf node_modules
     cd {{tauri_path}} && cargo clean