fix: correct working directory for gen:protobuf script

Fixes GitHub Actions workflow "Update WAProto" failure.

Problem:
- GenerateStatics.sh was being executed from project root
- Script looks for ./WAProto.proto (relative to CWD)
- This resolves to <root>/WAProto.proto (doesn't exist)
- Should be <root>/WAProto/WAProto.proto

Error in CI:
```
Error: ENOENT: no such file or directory, open 'WAProto.proto'
Error: Cannot find module '.../fix-imports.js'
```

Solution:
Change script execution to run from WAProto/ directory:
- Before: "sh WAProto/GenerateStatics.sh" (runs from root)
- After: "cd WAProto && sh GenerateStatics.sh" (runs from WAProto/)

Now paths resolve correctly:
- ./WAProto.proto → <root>/WAProto/WAProto.proto ✅
- ./fix-imports.js → <root>/WAProto/fix-imports.js ✅

https://claude.ai/code/session_01TvSrN9JmHZDdKMZDFWEcUS

package.json

@@ -28,7 +28,7 @@
     "changelog:preview": "conventional-changelog -p angular -u",
     "changelog:update": "conventional-changelog -p angular -i CHANGELOG.md -s -r 0",
     "example": "tsx ./Example/example.ts",
-    "gen:protobuf": "sh WAProto/GenerateStatics.sh",
+    "gen:protobuf": "cd WAProto && sh GenerateStatics.sh",
     "format": "prettier --write \"src/**/*.{ts,js,json,md}\"",
     "lint": "tsc && eslint src --ext .js,.ts",
     "lint:fix": "npm run format && npm run lint -- --fix",