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:*

pnpm-lock.yaml

@@ -83,6 +83,37 @@ importers:
         specifier: ^2
         version: 2.1.9(@types/node@22.19.15)
 
+  packages/prdy:
+    dependencies:
+      '@clack/prompts':
+        specifier: ^0.9
+        version: 0.9.1
+      '@mosaic/types':
+        specifier: workspace:*
+        version: link:../types
+      commander:
+        specifier: ^13
+        version: 13.1.0
+      js-yaml:
+        specifier: ^4
+        version: 4.1.1
+      zod:
+        specifier: ^3.24
+        version: 3.25.76
+    devDependencies:
+      '@types/js-yaml':
+        specifier: ^4
+        version: 4.0.9
+      '@types/node':
+        specifier: ^22
+        version: 22.19.15
+      typescript:
+        specifier: ^5
+        version: 5.9.3
+      vitest:
+        specifier: ^2
+        version: 2.1.9(@types/node@22.19.15)
+
   packages/queue:
     dependencies:
       '@modelcontextprotocol/sdk':