Dependabot Sweep

Use when the user wants to fix, address, clear, or resolve open Dependabot security/vulnerability alerts for a repository, end to end. Fetches open alerts via the gh CLI, fixes them per ecosystem (pnpm/npm overrides + lockfile regen, cargo update, pip/go/bundler), verifies with audit and frozen-lockfile installs, then branches → commits → pushes → opens a PR, and squash-merges once CI is green — escalating only when a fix carries breaking-change risk or can't be resolved. Trigger on "/dependabot-sweep", "address the dependabot alerts", "fix the security vulnerabilities", "clear the dependabot alerts", "handle the dependency vulnerabilities", "sweep dependabot".