Align Step 2 prompt and screenshot

[a-a-ron]

Summary

• replace the Step 2 visual with the exact 27-line starter tests/test_bill_splitter.py state and seven-test baseline
• add a concise, copy-ready Copilot prompt that requests assumptions first and exactly two named tests
• keep the prompt grounded in the public API, explicit Decimal lists, and no production changes

Validation

• mechanically matched all 27 screenshot editor lines, including blanks, to tests/test_bill_splitter.py
• verified both expected result lists against split_bill
• focused-test grader passes with prompt-compatible tests; resulting suite passes 9 tests
• image is readable at 1440x900 and the repository-aware rendered URL resolves correctly
• workflow YAML parsing, Markdown checks, and git diff --check pass

Follow-up to #4, which was merged before this Step 2 feedback was applied.

[Copilot]

Copilot review overview

🟢 Approval recommended

The prompt matches the public API, grader requirements, expected results, and stated scope.

Review effort: Balanced
Findings: None

What changed in this PR

Aligns the Step 2 learner instructions with the updated screenshot and required focused tests.

Changes:

• Updates the screenshot description for the seven-test baseline.
• Adds a copy-ready Copilot prompt requesting assumptions and two exact tests.

File	Description
.github/​steps/​2-step.md	Updates the Step 2 visual description and test-generation prompt.

---

💡 Add a code-review agent skill or configure MCP servers for context-aware, tailored reviews. Learn more in the docs.