# ConfigKit

An opinionated Go library for applications that use YAML configuration files.

ConfigKit's initial loader accepts one strict YAML
source (or explicit defaults-only input), optionally traverses explicit path and glob
imports, strictly composes their disjoint definitions, applies typed defaults, and
can overlay one selected fixed profile and check an application schema version. It
returns detached metadata and safe diagnostics.
Applications may perform audited defaulting and normalization through a resolver,
then report domain errors and warnings through read-only semantic validation. Secret
tags and a path predicate drive deterministic redacted effective YAML. Typed secret
references resolve environment names before validation, and explicit
secrets-directory bootstrap is available as a separate startup operation. Explicit
CLI override records apply above profiles. Value explanation is available through
detached structured records and deterministic redacted output.

```go
type Config struct {
    Enabled bool `yaml:"enabled"`
    Workers int  `yaml:"workers"`
}

func ReadConfig(path string) (Config, error) {
    result, err := configkit.Load[Config](configkit.File(path))
    if err != nil {
        return Config{}, err
    }
    return result.Config, nil
}
```

The [configuration contract](docs/config.md) describes implemented behavior. The
[consumer adoption guide](docs/consumers/README.md) provides maintained Narratio-,
Notarius-, WeatherReporter-, and Seriatim-shaped examples and migration guidance.
The [initial target record](docs/roadmap/initial.md) links implemented feature owners
and preserves deliberately deferred scope. The [implementation plan](docs/roadmap/implementation.md)
records completion evidence until release-candidate preparation retires it. See the
[development guide](docs/development.md) for repository orientation and the
[release procedure](docs/release.md) for maintainer-only candidate and publication
steps.