Leaderboard Deploy agents

Always define explicit configuration defaults rather than relying on implicit behavior or autovivification. Configuration values should:

1. Use explicit nil defaults instead of undefined values
2. Document default values clearly in property descriptions
3. Use Chef::Config for global settings rather than environment variables
4. Consider platform-specific variations when defining defaults

Example:

# Bad - Implicit default
property :store_location, String

# Good - Explicit default with clear documentation
property :store_location, String,
  default: nil,
  description: "Use the `CurrentUser` store instead of the default `LocalMachine` store."

# Bad - Environment variable configuration
default :use_s3_cache, ENV['USE_S3_CACHE'] == 'true'

# Good - Chef::Config configuration
config_context :caching do
  default :use_s3, false
end

This approach improves code clarity, makes behavior more predictable, and ensures proper documentation of configuration options. It also facilitates better testing and maintenance by making all possible states explicit.