add compact test output with step descriptions

[theodore-s-beers]

• Add optional plain-language descriptions for CLI test steps
• Show compact pass/fail output by default for submissions and local tests
• Add --verbose to display full details for every step
• Expand failed steps while hiding later steps
• Apply visual truncation to HTTP response bodies
• Preserve command/request fallbacks for older manifests

[Copilot]

Pull request overview

This PR enhances the CLI test renderer to support plain-language step descriptions and a more compact default output mode, with a --verbose flag to show full per-step detail. It also adds visual truncation for large command/HTTP outputs and wires step descriptions through the manifest → runner → renderer pipeline.

Changes:

• Add description support for CLI steps (manifest + message plumbing) and render it alongside a technical detail string.
• Default to compact pass/fail step lines, expanding failed steps (and hiding later steps) unless --verbose is used.
• Truncate large stdout/HTTP response bodies for readability, and add renderer-focused tests.

Reviewed changes

Copilot reviewed 12 out of 12 changed files in this pull request and generated 3 comments.

Show a summary per file

File	Description
render/view.go	Implements compact/verbose rendering logic, failure expansion, and output truncation.
render/view_test.go	Adds tests for compact vs verbose output, description fallback, and truncation behavior.
render/render.go	Adds support for step description + detail fields and threads verbose into the model.
render/models.go	Renames step display fields and adds verbose to the root model/init.
render/http.go	Applies visual truncation to HTTP response bodies (including pretty JSON).
messages/messages.go	Extends StartStepMsg with an optional plain-language Description.
cmd/submit.go	Adds --verbose/-v flag and passes it into the renderer.
cmd/run.go	Adds --verbose/-v flag for non-submit runs.
cmd/localtest.go	Adds --verbose/-v flag and passes it into the renderer.
cmd/localtest_test.go	Updates local CLI data parsing test to include/verify step description in YAML.
client/lessons.go	Adds CLIStep.Description YAML field to support descriptions in manifests.
checks/runner.go	Passes step description into StartStepMsg for both CLI and HTTP steps.

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[Copilot]

Pull request overview

Copilot reviewed 12 out of 12 changed files in this pull request and generated 1 comment.

[hbeckmann]

I love this - this should really help clean things up on those courses with massive jq steps 🙏