Better Usage Output

[bbengfort]

Scope of changes

Improves usage output to use env definition instead of prefixed key if it is set.

Type of change

• new feature
• bug fix
• documentation
• testing
• technical debt
• other (describe)

Author checklist

• I have manually tested the change and/or added automation in the form of unit tests or integration tests
• I have added new test fixtures as needed to support added tests

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Note

Low Risk
Low risk: changes are limited to how usage renders keys in templates plus updating fixtures/docs; it does not affect env loading or validation behavior.

Overview
Improves usage.Usagef output so displayed variable names prefer the explicit env/envconfig override (env.Info.Alt) instead of the computed prefixed key, making help text match the actual external env var users set.

Updates usage tests/fixtures to cover an overridden required DATABASE_URL field and adjusts README docs with an example of using Confire’s InvalidConfig/Join/Wrap error helpers when implementing custom Validator logic.

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