docs: clarify path dependency portability

[nightcityblade]

Pull Request Check List

Resolves: #6752

• Added tests for changed code. N/A — documentation-only change.
• Updated documentation for changed code.

Summary

Clarify that path dependencies are intended for local development and remain
non-portable in built distributions because Poetry records them as file://
requirements. Recommend publishing the dependency and replacing the path with a
version constraint before distribution.

Validation

• pre-commit run --files docs/dependency-specification.md
• Built the documentation with the python-poetry/website build script.
• Built the static website with Hugo and verified the rendered note.
• Reproduced the behavior with Poetry by inspecting wheel and sdist metadata.

[sourcery-ai]

Hey - I've reviewed your changes and they look great!

Sourcery assessment

Approved.

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