no transparent errors should bubble to top of app

[robfitzgerald]

attempting to run a compass app and i was getting this error:

[2024-04-08T22:49:11Z ERROR mep_routee_compass] invalid type: map, expected variant identifier

this was due to the fact that my configuration TOML's output policy had double braces instead of single:

[[response_output_policy]] # should be [...]
type = "file"

the error is vague because CompassAppError has a transparent ConfigError (from the config crate):

    #[error(transparent)]
    ConfigError(#[from] ConfigError),

Compass' top-level error types should not be transparent unless they do not require context. this should instead return a BuildError or similar where the developer includes the contextual information:

    #[error("error building component {0} of type {1}: {2}")]
    BuildError(String, String, String),