fix(ci): resolve plugin build failure in Turbopack (#216)
Two issues caused the CI build to fail:
1. Turbopack can't resolve .js → .tsx imports inside node_modules
(the plugin uses ESM .js extensions required by its NodeNext config).
Fix: create .js symlinks pointing to .tsx/.ts source files after
copying the plugin into node_modules.
2. tsc follows the pnpm symlink to ../barazo-plugins where @types/react
isn't installed, causing type-check failures.
Fix: install plugin-signatures devDependencies during CI setup.
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