Initial implementation of jrx - JSX factory for json-render

JSX factory that compiles JSX trees into json-render Spec JSON.
Framework-agnostic custom jsx-runtime, no React dependency at runtime.

- jsx/jsxs/Fragment via jsxImportSource: "jrx"
- render() flattens JrxNode tree into { root, elements, state? } Spec
- Auto key generation (type-N) with explicit key override
- Full feature parity: visible, on, repeat, watch as reserved props
- Function components via component() or plain functions
- @json-render/core as peer dependency

Co-authored-by: Ona <no-reply@ona.com>

tsconfig.json

@@ -0,0 +1,25 @@
+{
+  "compilerOptions": {
+    "target": "ES2020",
+    "module": "ESNext",
+    "moduleResolution": "bundler",
+    "lib": ["ES2020", "DOM"],
+    "strict": true,
+    "esModuleInterop": true,
+    "skipLibCheck": true,
+    "forceConsistentCasingInFileNames": true,
+    "declaration": true,
+    "declarationMap": true,
+    "sourceMap": true,
+    "outDir": "dist",
+    "rootDir": "src",
+    "jsx": "react-jsx",
+    "jsxImportSource": "jrx",
+    "baseUrl": ".",
+    "paths": {
+      "jrx/jsx-runtime": ["./src/jsx-runtime"],
+      "jrx/jsx-dev-runtime": ["./src/jsx-dev-runtime"]
+    }
+  },
+  "include": ["src"]
+}