fix: support no-dev installs in production

[vitormattos]

Summary

• make the post-install flow production-safe when Composer runs with --no-dev
• avoid relying on composer bin ... in production installs where the bin plugin is not available
• keep the scoped runtime build working in both development and production modes

How to test

• run composer install --no-dev
• confirm the install no longer fails with Command "bin" is not defined
• run composer install in development mode and confirm the scoped runtime toolchain still builds correctly

Checklist

• Tests added or updated
• Documentation updated if needed
• No deprecated APIs used

AI disclosure

• AI assistance was used to help prepare this change.