initial project scaffold

Rust workspace with nomina-core (rename engine) and nomina-app (Tauri v2 shell).
React/TypeScript frontend with tabbed rule panels, virtual-scrolled file list,
and Zustand state management. All 9 rule types implemented with 25 passing tests.

crates/nomina-app/capabilities/default.json

@@ -0,0 +1,10 @@
+{
+  "identifier": "default",
+  "description": "Default permissions for Nomina",
+  "windows": ["main"],
+  "permissions": [
+    "core:default",
+    "dialog:default",
+    "shell:default"
+  ]
+}