Function load 

pub fn load(
    config_path: &Utf8Path,
) -> Result<Vec<UserExtensionHost>, UserExtensionError>

Load user-extension hosts from a config.toml path.

Returns an empty Vec if the path does not exist (the user simply has not extended the gate). Returns Err only when the file exists but cannot be read, parsed, or contains invalid pattern(s).

Every entry in the returned vec has its host already validated at the type level via HostPattern.

Errors

• UserExtensionError::Io for filesystem errors other than not-found.
• UserExtensionError::Parse for malformed TOML.
• UserExtensionError::InvalidPatterns for invalid patterns; the variant carries every offending entry, not just the first (review pass I6).