Fix #94

[mercael91]

Closes #94

What changed

Both files listed in the issue now report actionable messages on the 8 bare
assertions, and nothing else in the curriculum is touched:

• checks/regex/regex9.py — the two bare assertions get messages. The combined
  year/month/day assertion stays one predicate (the issue's "predicates
  unchanged" criterion); only its message was added, naming the expected parts and
  the actual ones.
• checks/regex/regex10.py — the six bare group(...) assertions get messages
  with expected and actual values.

Messages are wrapped the way the other regex checks do it (regex8.py), so every
line stays inside the 80-column limit from CONTRIBUTING.md. The single long line
that remains (regex10.py:4, 98 chars) is unchanged from dev.

Nothing else moved: assertion counts are the same as dev (regex9: 6, regex10: 12),
predicates, ordering, side effects and print output are untouched, and the code
stays Python 3.9 compatible (f-strings with !r only).

Verification

• Both checks run against the reference answers and print regex9 ✓ / regex10 ✓.
• With a deliberately wrong match, the new messages fire and name the expected
  value, e.g.
  date parts should be ('1999', '12', '31'), got ('WRONG', 'WRONG', 'WRONG')
  and m2.group('level') should be 'WARNING', got 'WRONG'.
• The AST probe from the issue reports 0 bare assertions in the two listed files.
• awk 'length>80' over both files reports no new long lines (before: 9 lines over
  the limit; now only the pre-existing regex10.py:4).
• CI: all 8 matrix jobs green (ubuntu 3.9–3.13, macos 3.13, windows 3.9/3.13).

Note

This covers all 8 assertions the issue lists. It supersedes #145, which was closed
due to inactivity and only touched regex9.py.

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