Add foreman/overmind requirement to Getting Started guides

[justin808]

Summary

This PR addresses the issue where new developers following the Getting Started guides encounter the "can't find executable foreman" error when running ./bin/dev. The PR adds clear documentation about the foreman/overmind prerequisite in both the Quick Start and Using React on Rails guides.

Supersedes: #1870 (rebased on latest master after docs reorganization in #1860)

Changes

Quick Start Guide (docs/getting-started/quick-start.md)

• Added "Foreman or Overmind" to Prerequisites section
• Added installation instructions before the bin/dev command with:
  • brew install overmind for macOS users
  • gem install foreman for global installation
  • Links to detailed installation guides for both tools
  • Important note about global installation for foreman

Using React on Rails Guide (docs/getting-started/using-react-on-rails.md)

• Added note in Development Workflow section about foreman/overmind requirement
• Included quick installation commands
• Cross-referenced Quick Start guide for detailed instructions

Impact

• Existing installations: No impact - documentation only
• New installations: Better developer experience with clear requirements upfront, preventing common "can't find executable" errors

Testing

• Verified all files end with newline characters (CLAUDE.md requirement)
• Passed all pre-commit hooks (prettier, rubocop, trailing-newlines)
• Manually verified markdown formatting is correct

🤖 Generated with Claude Code

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📥 Commits

Reviewing files that changed from the base of the PR and between a59bbb7 and 1c129b4.

📒 Files selected for processing (2)

• docs/getting-started/quick-start.md (2 hunks)
• docs/getting-started/using-react-on-rails.md (1 hunks)

✨ Finishing touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch justin808/add-foreman-note-rebased

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