chore: add workflow_dispatch trigger to release workflow (#56)

Allows manually triggering the release workflow from the GitHub Actions UI.

Co-authored-by: Claude Opus 4.6 <noreply@anthropic.com>

Author: satoshai-dev

.github/workflows/release.yml

@@ -4,6 +4,7 @@ on:
   push:
     branches:
       - main
+  workflow_dispatch:
 
 concurrency: ${{ github.workflow }}-${{ github.ref }}