Homebrew 7.0.0

Homebrew 7.0.0 is less a feature drop and more a “who do we still have your back on” release. brew vulns now checks installed packages against an advisory database, and Linux sandboxing swaps Bubblewrap for Landlock with zero extra deps. The one to actually plan around: Intel Macs drop to Tier 3 (no new prebuilt bottles, support ends September 2027), and macOS 10.15 and earlier are dropped outright. Check this before your next CI image rebuild.