fix: correct analyzer statistics

[mikemikimike]

Summary / Problem

Closes #25.

The analyzer miscounted C-style inline block comments, omitted async def functions from Python statistics, and stored None for relative imports such as from . import utils.

Changes

• Close a block-comment state on the same line when /* ... */ is inline, so following executable lines are not counted as comments.
• Count ast.AsyncFunctionDef alongside regular Python functions.
• Represent relative imports with their dot level instead of appending None when ImportFrom.module is absent.
• Add focused regression tests for all three behaviors.

Tests

• .venv\\Scripts\\python.exe -m pytest --basetemp=.pytest-tmp-full tests/ -q — 3 passed.
• .venv\\Scripts\\python.exe -m py_compile setup.py insight\\__init__.py insight\\analyzer.py insight\\cli.py insight\\detector.py insight\\reporter.py insight\\utils.py — passed.
• .venv\\Scripts\\python.exe -c "import insight" — passed.
• Ruff check and format check for tests\\test_analyzer.py — passed.
• Targeted Ruff check for insight\\analyzer.py with the pre-existing I001, BLE001, and LOG015 findings excluded — passed.

Compatibility / Known limitations

The existing statistics shape is preserved; only the affected values are corrected. The upstream baseline currently reports 13 existing Ruff findings, including historical findings in insight/analyzer.py; no unrelated cleanup is included here. Tests emit the existing deprecation warning from the google.generativeai dependency but do not call the external API.

Issue link

#25