fix(curriculum): add actionable enum assertion messages

[frobel0520]

Summary

Closes #105.

Add actionable assertion messages to the existing enum curriculum checks in checks/enums/enums1.py through checks/enums/enums6.py.

The predicates, check order, side effects, and success output are unchanged.

Tests

• python -m pytest tests/integration/test_solution_verify.py -q — 1 passed
• python -m pythonlings --root tests/fixtures/passing_curriculum verify — passed (passing1, passing2)
• python -m pytest -q — 208 passed, 7 failed in this Windows environment:
  • 6 failures cannot create symlinks (WinError 1314)
  • 1 failure resolves an older installed pythonlings package without pythonlings.main
• git diff --check — passed

Screenshots

Not applicable.

Checklist

• Updated docs when behavior changed — not applicable; assertion messages only
• Added or updated tests — not applicable; issue scope is assertion messages
• Verified python -m pytest -q — run; environment-only failures are documented above

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