Fix rake tasks after workspace structure merge (PR #1830) (#1839)

## Summary

Fixes two rake tasks that were broken/discovered after the workspace
structure changes in PR #1830:

• **`node_package.rake`**: Fixed `yalc publish` → `yarn yalc publish` to
work with private workspace root
• **`shakapacker_examples.rake`**: Fixed missing space in rails command
+ updated to use `npm install` instead of `yarn`

## Issues Found

1. **`yalc publish` fails with private workspace root**: After PR #1830
made root package.json private (standard practice), `yalc publish` fails
with "Will not publish package with `private: true`"
- **Fix**: Use `yarn yalc publish` which delegates to the publishable
workspace package

2. **Rails command syntax error**: Missing space in `rails_options +=
"--skip-javascript"` caused `webpack--skip-javascript`
   - **Fix**: Add space: `rails_options += " --skip-javascript"`

3. **Package manager mismatch**: Rake task runs `yarn` but Shakapacker
now defaults to `npm` when no lockfiles exist
   - **Fix**: Use `npm install` to match Shakapacker's choice

## Test Plan

- [x] `rake node_package` - Successfully builds and publishes with yalc
- [x] `rake shakapacker_examples:gen_basic` - Successfully generates
Rails app with React on Rails
- [x] Manual testing confirmed all three fixes work together

## Root Cause

The workspace restructuring in PR #1830 was correct and follows standard
practices. These rake tasks simply needed updates to work with the new
structure.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

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<!-- This is an auto-generated comment: release notes by coderabbit.ai
-->
## Summary by CodeRabbit

- Bug Fixes
- Fixed example generator so CLI options (e.g., skipping JavaScript) are
applied reliably during project creation.

- Chores
- Switched example project dependency installation from Yarn to npm for
consistency.
- Standardized package publishing to run via Yarn after the build step.

These updates improve example generation reliability and align tooling
across workflows.
<!-- end of auto-generated comment: release notes by coderabbit.ai -->

---------

Co-authored-by: Claude <[email protected]>
Co-authored-by: Judah Meek <[email protected]>

Author: 3 people

rakelib/node_package.rake

@@ -7,7 +7,7 @@ namespace :node_package do
 
   task :build do
     puts "Building Node Package and running 'yalc publish'"
-    sh "yarn run build && yalc publish"
+    sh "yarn run build && yarn yalc publish"
   end
 end
 

rakelib/shakapacker_examples.rake

@@ -29,31 +29,15 @@ namespace :shakapacker_examples do # rubocop:disable Metrics/BlockLength
     task example_type.gen_task_name_short => example_type.clobber_task_name do
       puts "Running shakapacker_examples:#{example_type.gen_task_name_short}"
       mkdir_p(example_type.dir)
-      example_type.rails_options += "--skip-javascript"
-      sh_in_dir(examples_dir, "rails new #{example_type.name} #{example_type.rails_options}")
+      sh_in_dir(examples_dir, "rails new #{example_type.name} #{example_type.rails_options} --skip-javascript")
       sh_in_dir(example_type.dir, "touch .gitignore")
       sh_in_dir(example_type.dir,
                 "echo \"gem 'react_on_rails', path: '#{relative_gem_root}'\" >> #{example_type.gemfile}")
       sh_in_dir(example_type.dir, "echo \"gem 'shakapacker', '>= 8.2.0'\" >> #{example_type.gemfile}")
       bundle_install_in(example_type.dir)
       sh_in_dir(example_type.dir, "rake shakapacker:install")
-
-      # Skip validation during generator run since npm package isn't installed yet
-      #
-      # ENV Variable Scope: We prefix each shell command with the ENV variable rather than
-      # setting it in the Ruby process for these reasons:
-      #
-      # 1. Each command spawns a new shell process with its own environment
-      # 2. The ENV variable is automatically scoped to each command (no cleanup needed)
-      # 3. This differs from the generator approach in lib/generators/react_on_rails/install_generator.rb
-      #    which sets ENV in the Ruby process and requires explicit cleanup
-      #
-      # This approach is simpler and safer for rake tasks that invoke shell commands.
-      generator_commands = example_type.generator_shell_commands.map do |cmd|
-        "REACT_ON_RAILS_SKIP_VALIDATION=true #{cmd}"
-      end
-      sh_in_dir(example_type.dir, generator_commands)
-      sh_in_dir(example_type.dir, "yarn")
+      sh_in_dir(example_type.dir, example_type.generator_shell_commands)
+      sh_in_dir(example_type.dir, "npm install")
     end
   end