curriculum: add actionable assertion messages to generators checks

[Ali-Nawaz-devt]

Closes #90
Closes #91

Summary

Adds actionable assertion messages to all 24 currently bare assertions across the 7 generators check files (14 from #90, 10 from #91). Preserves every assertion predicate, execution order, helper statement, and success print. Two asserts (next(c) == 0, next(c) == 1 in generators9.py) use static messages rather than echoing the actual value, since Counter is a stateful iterator and re-calling next(c) inside the message would advance it and corrupt the rest of the test sequence.

Validation

• AST probe (per curriculum: add actionable assertion messages to generators checks (batch 1 of 2) #90/curriculum: add actionable assertion messages to generators checks (batch 2 of 2) #91): 24/24 messages added, 0 remaining across generators1, 3, 6, 7, 8, 9, 10
• python -m pytest tests/integration/test_solution_verify.py -q — 1 passed
• python -m pytest -q — 215 passed
• pythonlings --root tests/fixtures/passing_curriculum verify — passing1, passing2 passed

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