Clarify contact sheet label help text

[Ahmed-Hindy]

Summary

• update contact-sheet CLI help from filename labels to layer labels
• update the usage docs table to match the rendered label semantics
• add a CLI help regression test for the label wording

Follow-up to review feedback after #88.

Tests

• uv run --extra dev pytest tests\test_cli.py
• uv run --extra dev ruff check src\renderkit\cli\main.py tests\test_cli.py

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ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro Plus

Run ID: 27d9db18-9372-46ea-b0fc-972f50d72fc4

📥 Commits

Reviewing files that changed from the base of the PR and between 47e7020 and 563c5e1.

📒 Files selected for processing (3)

• docs/usage.md
• src/renderkit/cli/main.py
• tests/test_cli.py

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch dev/fix-contact-sheet-label-help

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[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

[codecov-commenter]

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Codecov Report

✅ All modified and coverable lines are covered by tests.

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