refactor: extract type aliases to _types.py to fix import cycle

[tbhb]

Summary

• Create new _types.py module containing all TypeAlias definitions for JSON and key types
• Remove # pyright: reportImportCycles=false pragma from _exceptions.py
• Update _json.py and _keys.py to import types from _types.py and re-export for backwards compatibility

Problem

Circular import between:

• _exceptions.py → needs JSONObject and Key for ConflictError type annotations
• _json.py → needs ParseError, LimitError from _exceptions.py
• _keys.py → needs InvalidKeyError, LimitError from _exceptions.py

Solution

Extract pure type aliases to _types.py with no dependencies on other JSONLT modules, breaking the cycle.

Test plan

• Type checking passes: uv run basedpyright src/jsonlt/
• All tests pass: uv run pytest tests/
• Package imports cleanly without warnings

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.

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[codspeed-hq]

CodSpeed Performance Report

Merging #13 will not alter performance

_{Comparing fix-import-cycle (137c151) with main (48ed64a)}

Summary

✅ 173 untouched
⏩ 1 skipped¹

Footnotes

1. 1 benchmark was skipped, so the baseline result was used instead. If it was deleted from the codebase, click here and archive it to remove it from the performance reports. ↩