refactor: defer Config loading — add explicit Config.load! method

Loading config.toml at module eval time (during require) runs before
the application's working directory is set, can slow down tests that
don't use config at all, and gives no way to reload between calls.

Move the load logic into Config.load! (mirrors the Options.parse! pattern
added in the previous commit). The module body now just initialises
@@config to {}.  Call Config.load! alongside Options.parse! at the top
of configure() so all entry points reload from the correct directory.

Also qualify File as ::File inside the RCM module to avoid resolving it
as RCM::File once the keyword files are loaded.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

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