feat(wave3): add @mosaic/prdy — TypeScript PRD wizard

- PRD CRUD: createPrd, loadPrd, savePrd, listPrds
- Interactive wizard using @clack/prompts
- Built-in templates: software, feature, spike
- CLI: prdy init | list | show
- Depends on @mosaic/types workspace:*

packages/prdy/tsconfig.json

@@ -0,0 +1,5 @@
+{
+  "extends": "../../tsconfig.base.json",
+  "compilerOptions": { "outDir": "dist", "rootDir": "src" },
+  "include": ["src"]
+}