Fix root CLI behavior to allow --help and other lightweight flags without requiring config

[ephur]

Currently, some commands (including --help) fail or behave unexpectedly if a config file is missing. This is due to logic in the root command eagerly loading config or performing work before Click has a chance to dispatch subcommands.

Problem

The root command appears to evaluate configuration at startup, preventing Click from lazily handling flags like --help, --version, etc. When the config is missing, even introspection commands fail — which is not expected behavior for CLI tools.

Solution

Refactor the CLI architecture so that:

• The root command does not load or validate config directly
• Any work that depends on config is pushed down into subcommands
• Add a decorator or helper (e.g. @with_config(optional=True)) to selectively load config only when needed
• Use click.Context.obj to store config state if needed across commands

This ensures:

• --help, --version, etc., work regardless of the filesystem
• Config validation only happens where relevant
• Cleaner separation of command responsibility