add option to capture cliCommand output

[theodore-s-beers]

• Add stdoutVariables support for CLI command steps
• Capture regex groups from command output into shared lesson variables
• Surface stdout variable parse errors in local CLI evaluation

[Copilot]

Pull request overview

Adds support for extracting values from CLI command stdout into shared lesson variables, and ensures parse/validation errors for that extraction are reported during local CLI evaluation.

Changes:

• Introduce stdoutVariables on CLI command steps, with {name, regex} definitions.
• Parse command stdout using regex capture groups and store matches into the shared variables map.
• Surface stdout-variable parsing errors in local evaluation via a new Err field on CLICommandResult, plus new tests.

Reviewed changes

Copilot reviewed 5 out of 5 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
client/lessons.go	Extends CLI lesson schema with stdoutVariables and adds Err to CLI command results for local error surfacing.
checks/cli.go	Implements stdout-variable parsing via regex capture groups and propagates parse errors back through command results.
checks/local.go	Fails local evaluation early when a CLI command result contains a parse error (result.Err).
checks/local_test.go	Adds coverage to ensure local evaluation reports stdout-variable parse errors as structured failures.
checks/cli_test.go	Adds tests for capturing stdout variables and interpolating captured values into subsequent commands.

---

💡 Add Copilot custom instructions for smarter, more guided reviews. Learn how to get started.