expose baseURL to cli commands

[theodore-s-beers]

Exposes the resolved lesson base URL to CLI command steps as ${baseURL}, including configured overrides.

[Copilot]

Pull request overview

This pull request exposes the resolved lesson base URL to CLI command steps via the ${baseURL} interpolation variable, intended to reflect the lesson default or a user-configured override.

Changes:

• Populate the per-run interpolation variables map with baseURL before executing CLI/HTTP steps.
• Add a unit test asserting ${baseURL} is interpolated into CLI commands for both default and overridden base URLs.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 2 comments.

File	Description
checks/runner.go	Adds baseURL into the shared interpolation variable map used by CLI command execution.
checks/runner_test.go	Introduces a test to verify ${baseURL} interpolation in CLI command steps for default vs override.

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[Copilot]

Pull request overview

Copilot reviewed 2 out of 2 changed files in this pull request and generated 2 comments.

[Copilot]

Pull request overview

Copilot reviewed 2 out of 2 changed files in this pull request and generated 1 comment.