Remove Zed-specific and CI scripts
Keep only essential development scripts:
- clippy (linting)
- linux (Linux dependency installation)
- metal-debug (macOS GPU debugging)
Removed:
- Version bumping scripts (Zed release process)
- CI helper scripts (target dir cleaning, crate version)
- Build tool installers (cmake, mold, wild, rustup)
- Prettier/shellcheck (Zed-specific checks)
- crate-dep-graph (references Zed crates)
- histogram (Python perf analysis)
- new-crate (references Zed licensing)
- lib/ helpers (blob-store, deploy, etc.)