feat: rust project initialization

nix/shell.nix

@@ -0,0 +1,49 @@
+{
+  inputs,
+  pkgs,
+  self,
+  rustVersion,
+  system,
+  ...
+}:
+inputs.devenv.lib.mkShell {
+  inherit inputs pkgs;
+  modules = [
+    {
+      packages = with pkgs; [
+        (rustVersion.override {
+          extensions = [
+            "clippy"
+            "rust-src"
+            "rust-analyzer"
+            "rustfmt"
+          ];
+        })
+        bacon
+        cargo-deny
+        cargo-edit
+        cargo-shuttle
+        cargo-tarpaulin
+        just
+        marksman # Markdown LSP server
+        tombi # TOML LSP server
+      ];
+
+      processes.run.exec = "bacon run";
+
+      enterShell = ''
+        echo "🦀 Rust MCP development environment loaded!"
+        echo "📦 Rust version: $(rustc --version)"
+        echo "📦 Cargo version: $(cargo --version)"
+        echo ""
+        echo "Available tools:"
+        echo "  - rust-analyzer (LSP)"
+        echo "  - clippy (linter)"
+        echo "  - rustfmt (formatter)"
+        echo "  - bacon (continuous testing/linting)"
+        echo "  - cargo-deny (dependency checker)"
+        echo "  - cargo-tarpaulin (code coverage)"
+      '';
+    }
+  ];
+}