pypi: resolve non-PyPI sources missing from PyPI

[daeho-ro]

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Claude is used to create codes but tested and reviewed by myself.

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package_name was always looked up on PyPI as name[extras]==<formula version>, which fails when a formula built from a non-PyPI source (e.g. a GitHub release) uses a version PyPI does not have, as with hermes-agent.

In that case, resolve the stable URL as a PEP 508 direct reference (name[extras] @ <url>) so extras' dependencies are kept. Formulae whose version exists on PyPI are unaffected.

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[MikeMcQuaid]

Thanks!

[dot-agi]

Thank you! Makes life easier for maintaining the hermes-agent formula.