improve: add missing type widening entries for bool/date combinations

[Coding-Dev-Tools]

Automated improvement by dev-engineer.

Adds 7 missing type widening rules to the _type_widening dict in converters.py:

• bool <-> int64, bool <-> float64, bool <-> date, date <-> string
• Prevents silent fallback to "string" when bool or date values appear alongside numeric types during schema inference.

Adds corresponding test coverage for the new widening paths.

All 132 tests pass, lint clean.

[github-actions]

🤖 Automated Code Review

✅ Ruff Lint — No issues

⚠️ Ruff Format — Formatting needed

Would reformat: conftest.py
Would reformat: src/datamorph/cli.py
Would reformat: src/datamorph/converters.py
Would reformat: tests/test_cli_error_paths.py
Would reformat: tests/test_converters.py
Would reformat: tests/test_edge_cases.py
Would reformat: tests/test_validate.py
7 files would be reformatted, 2 files already formatted

✅ Secret Detection — Clean

✅ Large Files — Within limits

📊 Diff Stats — 2 file(s) changed

 src/datamorph/converters.py |  7 +++++++
 tests/test_converters.py    | 13 +++++++++++++
 2 files changed, 20 insertions(+)

---

Verdict: ⚠️ Warnings — Lint/format issues found. Recommend fixing before merge.

Automated by Coding-Dev-Tools/.github reusable workflow.