add some tests

[theodore-s-beers]

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[Copilot]

Pull request overview

This PR adds unit tests for several checks helpers (TMDL extraction, jq evaluation, HTTP request handling, and submission result application) while also doing minor cleanup (Go-style variable naming) and documentation adjustments.

Changes:

• Added new Go tests under checks/ covering TMDL block extraction, jq parsing/querying, HTTP interpolation/request execution, and submission result messaging.
• Renamed several Go locals from snake_case to camelCase for idiomatic Go style.
• Updated README command examples/placeholders for clarity.

Reviewed changes

Copilot reviewed 13 out of 13 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
README.md	Tweaks CLI troubleshooting/config examples and placeholders.
cmd/root.go	Renames auth-related locals to camelCase.
cmd/logout.go	Renames api_url local to apiURL.
cmd/login.go	Renames loginUrl local to loginURL.
client/lessons.go	Clarifies comment on HTTPRequestTest field usage.
client/auth.go	Renames api_url local to apiURL in auth helpers.
checks/tmdl.go	Improves doc comment for ExtractTmdlBlock.
checks/tmdl_test.go	Adds unit tests for ExtractTmdlBlock (including tab indentation).
checks/runner_test.go	Adds unit tests for ApplySubmissionResults message emission.
checks/jq.go	Uses fmt.Fprintf with strings.Builder for jq test descriptions.
checks/jq_test.go	Adds unit tests for jq input parsing, querying, formatting, and path extraction.
checks/http.go	Minor formatting of http.NewRequest call sites.
checks/http_test.go	Adds unit tests for interpolation, HTTP request execution, and body truncation.

Comments suppressed due to low confidence (1)

client/auth.go:66

• LoginWithCode() never closes resp.Body after http.Post(...). This can leak connections and eventually stall future HTTP calls. Add a defer resp.Body.Close() immediately after confirming the request succeeded.

	resp, err := http.Post(apiURL+"/v1/auth/otp/login", "application/json", bytes.NewReader(req))
	if err != nil {
		return nil, err
	}

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