Remove legacy main module shim

[dprada]

Summary

• inline the deprecated pyunitwizard.main compatibility layer into the package initializer
• remove the standalone main.py module now that imports are redirected through pyunitwizard
• update utilities to import is_quantity from the package exports

Testing

• pytest

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https://chatgpt.com/codex/tasks/task_e_69099912b49083269642cfd9c77cb935

[chatgpt-codex-connector]

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[chatgpt-codex-connector]

Attach compatibility shim to package namespace

The new shim registers a pyunitwizard.main module with sys.modules.setdefault but never binds that module to the pyunitwizard package object. Because the entry already exists in sys.modules, import pyunitwizard.main completes without adding an attribute, so subsequent access still raises AttributeError. This breaks code that previously did import pyunitwizard.main followed by pyunitwizard.main.some_api. After creating the module you need to assign it to globals()["main"] (or otherwise expose it via the package) to retain the pre‑refactor behavior【F:pyunitwizard/init.py†L87-L87】

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