fix(cli): add default values for action and readme path options

[Copilot]

Rebased PR #267 onto current main. The workflow refactoring that replaced create_npm_release.yml already addressed the multi-branch release restriction. This PR preserves the CLI defaults that were part of the original change.

Changes

• Added CLI option defaults: pathsAction → './action.yml', pathsReadme → 'README.md'
• Updated type definition: Added default?: string to ArgvOptionProperties
• Fixed tests: Removed path validation assertions (now optional with defaults) and isolated env vars in stringify test

argvOptions[ConfigKeys.pathsAction] = {
  alias: ['pathsAction', 'action'],
  type: 'string',
  describe: 'Path to the action.yml',
  default: './action.yml',  // Added
};

Users can now run the CLI without explicitly specifying action or readme paths when using standard locations.

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[coderabbitai]

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