Show install status in which-formula

[MikeMcQuaid]

Fixes #22282

While we're here:

• Help users identify already-installed providers in command searches
• Share executables.txt fetching and parsing across Bash commands
• Keep Bash formatting helpers aligned with their Ruby counterparts

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[Copilot]

Pull request overview

This pull request updates brew which-formula to display whether matching provider formulae are installed, and refactors shared Bash helpers so multiple commands can reuse common API/executables-db logic and consistent output formatting.

Changes:

• Add install-status rendering to which-formula output (with emoji or text labels depending on HOMEBREW_NO_EMOJI).
• Extract shared Bash helpers into utils.sh (output/formatting) plus utils/api.sh and utils/executables.sh (executables.txt download + parsing).
• Update brew update and brew exec to reuse the shared executables database logic and announce executables.txt downloads.

Reviewed changes

Copilot reviewed 21 out of 21 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
Library/Homebrew/utils/wrapper.sh	Switches helper sourcing from removed utils/helpers.sh to new utils.sh.
Library/Homebrew/utils/tty.sh	Adds Bash TTY/color detection + columns() helper.
Library/Homebrew/utils/tty.rb	Adds cross-reference comment for Bash columns().
Library/Homebrew/utils/ruby.sh	Updates sourcing to utils.sh for brew/odie helpers.
Library/Homebrew/utils/output.rb	Adds “keep in sync” comments for Bash output/formatting parity.
Library/Homebrew/utils/helpers.sh	Removes legacy Bash helper file (superseded by utils.sh + subhelpers).
Library/Homebrew/utils/formatter.sh	Adds Bash formatting helpers (headline, bold, label coloring).
Library/Homebrew/utils/formatter.rb	Adds cross-reference comments for Bash formatter helpers.
Library/Homebrew/utils/executables.sh	Centralizes executables.txt caching/downloading and matching logic.
Library/Homebrew/utils/api.sh	Introduces shared API URL/curlrc/time-cond helpers for Bash.
Library/Homebrew/utils.sh	New consolidated Bash helpers (ohai/opoo/onoe/odie, pretty status, shims).
Library/Homebrew/test/cmd/which-formula_spec.rb	Updates integration expectations to include install status + adds download announcement test.
Library/Homebrew/test/cmd/update_spec.rb	Refactors test setup for new utils layout and adds executables.txt announcement test.
Library/Homebrew/list.sh	Updates to source utils.sh (for columns, ohai, etc.).
Library/Homebrew/extend/kernel.rb	Adds cross-reference comment for Bash which().
Library/Homebrew/cmd/which-formula.sh	Uses shared executables helpers and prints install status per formula.
Library/Homebrew/cmd/update.sh	Reuses shared API helpers, sources executables helpers, and announces executables.txt fetches.
Library/Homebrew/cmd/setup-ruby.sh	Updates to source utils.sh.
Library/Homebrew/cmd/exec.sh	Uses shared executables helpers instead of sourcing which-formula script.
Library/Homebrew/brew.sh	Switches global helper sourcing from utils/helpers.sh to utils.sh.
AGENTS.md	Documents convention for keeping mirrored Bash/Ruby logic in sync with two-way comments.

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