Repository-wide formatting pass over src/ and tests/: sorted imports and
__all__ entries, dropped redundant `# -*- coding: utf-8 -*-` headers,
unquoted forward-reference annotations (safe under
`from __future__ import annotations`), merged nested `with` statements,
moved `Iterable` and friends from `typing` to `collections.abc`, and
removed `# noqa: F401` markers that no longer suppress anything.
No behavioural changes. Unit and integration suites show the same four
pre-existing failures before and after the pass.
Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
* Remove legacy *main.py* and introduce *pkgmgr* module entry via *python -m pkgmgr*
* Add ***main**.py* as the canonical entry point delegating to the CLI
* Export *PYTHONPATH=src* in Makefile to ensure reliable imports in dev and CI
* Update setup scripts (venv & nix) to use module execution
* Refactor all E2E tests to execute the real module entry instead of file paths
This aligns pkgmgr with standard Python packaging practices and simplifies testing, setup, and execution across environments.
https://chatgpt.com/share/693c9056-716c-800f-b583-fc9245eab2b4
