Rename package from @valknar/vpinball-wasm to vpinball-wasm

Unscoped, matching this project's other Gitea-published package
(triggershell) - the registry is already scoped to the right owner via
publishConfig.registry's URL path (.../valknar/npm/), so an npm scope
on the package name itself is redundant. The old @valknar/vpinball-wasm
package published under the previous name is being removed manually.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

package/src/types.ts

@@ -1,5 +1,5 @@
 /**
- * Public TypeScript surface for @valknar/vpinball-wasm.
+ * Public TypeScript surface for vpinball-wasm.
  *
  * This wraps the raw Emscripten-generated module (dist/vpinball.js) so
  * consumers don't need to know about ccall/cwrap/FS internals directly.