Lower Python requirement to >=3.9 and verify install in conda+docker …

[tawsifazad23]

…(#66)

• Lowered minimum Python requirement in pyproject.toml from 3.10 → 3.9
• Verified editable install and import under:
  • Conda environment (Python 3.9) - pip install -e . succeeded; import chatdbg works
  • Docker python:3.9 image (GDB uses Python 3.13) - added /work/src to sys.path for import
• Confirmed why executes without old_stuff.chatdbg_utils AttributeError

[nicovank]

Thanks!

Can you also change the .github/workflows CI files to include 3.9? Other than that LGTM.

[emeryberger]

Can you explain why exactly we care about 3.9 support? It's about to be end-of-life - Oct 31 2025 (see https://endoflife.date/python).

[nicovank]

We talked about it in person -- and I said if the fix is just lowering it in pyproject, then the cost is low and it'll fix the install for anyone still using 3.9 (IIRC Amazon / others used 3.8 a few months into the EOL date before moving to 3.10?). Seems like lowering pyproject is enough, so why not. But the moment we use a 3.10 exclusive feature we should definitely bump it back.

[tawsifazad23]

Thanks!

Can you also change the .github/workflows CI files to include 3.9? Other than that LGTM.

Added Python 3.9 to CI matrices (sanity.yml and code-quality.yml).
release.yml left unchanged since it only builds/publishes under >=3.11.
All set — ready for re-review