Add __main__.py: support python -m oracletrace

[AnshBajpai05]

python -m oracletrace currently fails:

$ python -m oracletrace script.py
No module named oracletrace.__main__; 'oracletrace' is a package and cannot be directly executed

The oracletrace console script works fine, but -m is what people reach for inside venvs and CI — it's the spelling that guarantees the interpreter and the package agree.

Fix: a minimal oracletrace/__main__.py delegating to the existing cli.main(), mirroring the [project.scripts] entry point.

Tests: two subprocess tests — --help under -m, and an end-to-end trace of a small script. The script is created under the repo root so it shares a drive with the package: tracing across Windows drives is a separate pre-existing issue (os.path.commonpath raises ValueError: Paths don't have the same drive in _is_user_code) that I'm happy to fix in a follow-up PR if you're interested.

🤖 Generated with Claude Code

[KaykCaputo]

(os.path.commonpath raises ValueError: Paths don't have the same drive in _is_user_code) that I'm happy to fix in a follow-up PR if you're interested.

Nice @AnshBajpai05 , I would be very grateful, you can go for it