docs(uv): clarify stage-packages usage

Metadata

Project: craft-parts
Number: #1589
Type: pull request
State: open
Author: gcomneno
Labels: —
Created: 2026-05-21 13:04:47+00:00
Updated: 2026-05-21 13:04:48+00:00
Closed: —

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Issue body

## Summary Clarify that the uv plugin creates the virtual environment in `${CRAFT_PART_INSTALL}` by default, and recommend using a separate part for unrelated `stage-packages`. Fixes #1580.

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