Add WASM parser and Vue dissector UI.

Ship a working HexPigeon: typed binary parsing in Rust/WASM, a three-pane frontend, and unit tests covering the field types.

Co-authored-by: Cursor <cursoragent@cursor.com>

shell.nix

@@ -0,0 +1,34 @@
+{ pkgs ? import <nixpkgs> {} }:
+
+pkgs.mkShell {
+  name = "hex-pigeon-dev";
+
+  buildInputs = with pkgs; [
+    # Rust + WASM toolchain
+    rustup
+    wasm-pack
+    binaryen          # wasm-opt
+
+    # Node / frontend
+    nodejs_22
+
+    # Utilities
+    pkg-config
+    openssl
+  ];
+
+  shellHook = ''
+    export RUSTUP_HOME="$HOME/.rustup"
+    export CARGO_HOME="$HOME/.cargo"
+    export PATH="$CARGO_HOME/bin:$PATH"
+
+    # Install stable + wasm32 target on first run
+    rustup toolchain install stable 2>/dev/null || true
+    rustup default stable 2>/dev/null || true
+    rustup target add wasm32-unknown-unknown 2>/dev/null || true
+
+    echo "HexPigeon dev shell ready"
+    echo "  • Build WASM : cd parser-wasm && wasm-pack build --target web --out-dir ../frontend/src/wasm"
+    echo "  • Frontend   : cd frontend && npm install && npm run dev"
+  '';
+}