We need better install instructions for limited download quota and low storage space (as there is no checks)

Subject: We need better install instructions for limited download quota and low storage space (as there is no checks)

I followed this: `pip install torch torchvision torchaudio --extra-index-url https://download.pytorch.org/whl/cu130`
I couldn't find the files imediatelly, they were at `/tmp/pip-unpack-...` !!!
I copied all I could before it errored while trying to install because it did not check for available space before installing!!!
All huge downloads from /tmp vanished!!!

I learned this should be the initial command, right?
`pip download -d "$HOME/.pip-download-cache" torch torchvision torchaudio --extra-index-url https://download.pytorch.org/whl/cu130`
Or better put this on `.bashrc`? (all search engine AI suggestions)
```
export PIP_FIND_LINKS="$HOME/.pip-download-cache"
export PIP_DOWNLOAD_CACHE="$PIP_FIND_LINKS"
export PIP_CACHE_DIR="$PIP_FIND_LINKS"
export PIP_DESTINATION_DIR="$PIP_FIND_LINKS"
```

Now, I place the files I managed to backup before pip erased them, at "$HOME/.pip-download-cache" in a way that pip detects before downloading: just put all files from all folders like `/tmp/pip-unpack-...` directly at destination folder and pip detects it.
Otherwise I will need to wait like a month to try it as pip almost depleted all my remaining quota.

Btw, pip doesn't resume existing download files (right?). I am still trying to get all links to use them with `wget`, but for now I can only list the packages, not the URLs (I don't know how to use pip and search engines' AI answers are hallucinating on commands that don't work).

No repository file or test is named. Start by reproducing the documented pip install command and checking pip's cache, temporary download, low-space, and resume behavior; done means the installation guidance accurately explains a quota- and storage-conscious workflow, including which commands and cache settings are supported.

Written by the indexing model from the issue text.