refactor: remove unused require statements

[dduugg]

Remove 29 unnecessary require statements across 30 files where the required file's exported constants are never referenced in the requiring file.

Three env-sync commands (nodenv-sync, pyenv-sync, rbenv-sync) had require "formula" despite only using Keg.new — replaced with require "keg" to match actual usage.

Where removing a top-level require exposed a missing direct dependency in a downstream file, the require was added there instead:

• commands.rb now requires homebrew directly (uses Homebrew.require?)
• diagnostic.rb now requires git_repository directly (uses GitRepository)
• api/formula/formula_struct_generator.rb now requires deprecate_disable directly (uses DeprecateDisable)
• system_config.rb now requires tap directly (uses CoreTap) and retains require "extend/ENV" (uses ENV.sensitive?, a method injected by that file)

All changes verified with brew lgtm --online.

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• Have you followed the guidelines in our Contributing document?
• Have you checked to ensure there aren't other open Pull Requests for the same change?
• Have you added an explanation of what your changes do and why you'd like us to include them?
• Have you written new tests (excluding integration tests) for your changes? Here's an example.
• Have you successfully run brew lgtm (style, typechecking and tests) with your changes locally?

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• AI was used to generate or assist with generating this PR. Claude Code was used to identify unused requires via static analysis (checking whether each required file's exported constants are referenced in the requiring file), verify each removal by reading the relevant files, and apply the changes. Each candidate was manually confirmed before editing. brew lgtm --online was run to verify style, types, and tests pass.

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[MikeMcQuaid]

Thanks, looks good when 🟢!

[dduugg]

Ok, let's try it, 🚢

[Copilot]

Pull request overview

This PR reduces unnecessary Ruby load-time dependencies by removing require statements for files whose exported constants aren’t referenced, and tightening a few requires to match actual usage.

Changes:

• Removed unused require statements across many Homebrew modules/commands.
• Replaced require "formula" with require "keg" in *-sync commands that only use Keg.new.
• Added a small number of direct requires where removing an upstream require revealed a missing direct dependency (e.g., tap, git_repository, deprecate_disable, homebrew).

Reviewed changes

Copilot reviewed 31 out of 31 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
Library/Homebrew/utils/tty.rb	Removes unused utils/output require from TTY helper module.
Library/Homebrew/utils.rb	Removes unused homebrew require from general-purpose utility module.
Library/Homebrew/system_config.rb	Replaces software_spec require with tap to match CoreTap usage.
Library/Homebrew/sbom.rb	Removes unused cxxstdlib and cachable requires from SBOM generation.
Library/Homebrew/rubocops/lines.rb	Removes unused macos_version require from RuboCop cop implementation.
Library/Homebrew/formulary.rb	Removes unused deprecate_disable require from formulary loader code.
Library/Homebrew/download_strategy.rb	Removes unused lazy_object require from download strategy base.
Library/Homebrew/diagnostic.rb	Removes unused requires and adds git_repository for direct GitRepository usage.
Library/Homebrew/dev-cmd/audit.rb	Removes unused formula_versions and utils/shared_audits requires.
Library/Homebrew/descriptions.rb	Removes unused formula_versions require.
Library/Homebrew/commands.rb	Switches from require "utils" to require "homebrew" for Homebrew.require?.
Library/Homebrew/cmd/upgrade.rb	Removes unused cask/macos require.
Library/Homebrew/cmd/search.rb	Removes unused descriptions require.
Library/Homebrew/cmd/reinstall.rb	Removes unused cask/macos require.
Library/Homebrew/cmd/rbenv-sync.rb	Replaces require "formula" with require "keg" to match Keg usage.
Library/Homebrew/cmd/pyenv-sync.rb	Replaces require "formula" with require "keg" to match Keg usage.
Library/Homebrew/cmd/postinstall.rb	Removes unused sandbox require.
Library/Homebrew/cmd/outdated.rb	Removes unused keg require.
Library/Homebrew/cmd/nodenv-sync.rb	Replaces require "formula" with require "keg" to match Keg usage.
Library/Homebrew/cmd/missing.rb	Removes unused tab require.
Library/Homebrew/cmd/info.rb	Removes unused keg require.
Library/Homebrew/caveats.rb	Removes unused language/python require.
Library/Homebrew/cask/url.rb	Removes unused utils/curl require.
Library/Homebrew/cask/dsl/base.rb	Removes unused on_system require from base DSL stanza class.
Library/Homebrew/cask/dsl.rb	Removes unused lazy_object require.
Library/Homebrew/cask/cask.rb	Removes unused utils/bottles require.
Library/Homebrew/cask/audit.rb	Removes unused utils/git require.
Library/Homebrew/bundle/skipper.rb	Removes unused hardware require.
Library/Homebrew/brew.rb	Removes unused warnings require from brew entrypoint.
Library/Homebrew/api/formula/formula_struct_generator.rb	Adds direct deprecate_disable require for DeprecateDisable usage.
Library/Homebrew/api/formula.rb	Removes unused autobump_constants require.

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