Introduces `context.Context` to the `FetchCourse` method and its call chain, allowing for cancellable network requests and timeouts. This improves application robustness when fetching remote course data.
A new configuration package centralizes application settings, loading them from environment variables with sensible defaults for base URL, request timeout, and logging.
Standard `log` and `fmt` calls are replaced with a structured logging system built on `slog`, supporting both JSON and human-readable text formats.
This change also includes:
- Extensive benchmarks and example tests.
- Simplified Go doc comments across several packages.
BREAKING CHANGE: The `NewArticulateParser` constructor signature has been updated to accept a logger, base URL, and timeout, which are now supplied via the new configuration system.
