Initialize Tauri v2 + React + TypeScript project with vault scanner

- Scaffold Vite + React + TypeScript frontend
- Add Tauri v2 backend with Rust
- Implement list_vault command: recursively scans .md files, parses
  YAML frontmatter (Is A, aliases, Belongs to, Related to, Status,
  Owner, Cadence), extracts title from H1 or filename
- 10 passing Rust tests for frontmatter parsing and vault scanning
- Configure Vitest and Playwright (test infrastructure)

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

src-tauri/capabilities/default.json

@@ -0,0 +1,11 @@
+{
+  "$schema": "../gen/schemas/desktop-schema.json",
+  "identifier": "default",
+  "description": "enables the default permissions",
+  "windows": [
+    "main"
+  ],
+  "permissions": [
+    "core:default"
+  ]
+}