fix(curriculum): add actionable itertools assertion messages

[frobel0520]

Summary

Adds actionable, beginner-facing messages to the seven bare assertions in the itertools checks requested by #100. The assertion predicates, execution order, helper statements, and success output are unchanged; only the six scoped check files are modified.

Closes #100

Tests

• python -m pytest tests/integration/test_solution_verify.py -q — 1 passed
• pythonlings --root tests/fixtures/passing_curriculum verify — passed
• AST audit of the six scoped files — 0 bare assertions remaining
• python -m pytest -q — 209 passed, 6 failed locally because Windows symlink creation is unavailable (WinError 1314); the failures are in existing symlink-security tests and are unrelated to this change

Screenshots

Not applicable; this is a curriculum check-message change.

Checklist

• Documentation update not needed; this change only improves hidden assertion feedback
• Added or updated tests — not needed; existing solution verification covers the reference answers
• Verified python -m pytest -q — local Windows symlink privilege prevented six existing tests from running

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