At some point, every dev hits it.
You’re installing something routine—npm install, a Go build, whatever—and macOS throws it in your face:

Disk Full.

You check storage, expecting the usual suspects. Not your videos. Not even Docker (okay, maybe a little).
It’s Homebrew quietly eating your SSD in the background.

Left unchecked, Homebrew turns into a museum of bad decisions:

• tools you needed once, 14 months ago
• duplicate runtimes “just in case”
• dependencies of dependencies of dependencies

Let’s fix it—without nuking your setup.