brew --jobs auto still broken

### `brew doctor` output ```shell all good ``` ### Verification - [x] I ran `brew update` twice and am still able to reproduce my issue. - [x] My "`brew doctor` output" above says `Your system is ready to brew` or a definitely unrelated `Tier` message. - [x] This issue's title and/or description do not reference a single formula e.g. `brew install wget`. If they do, open an issue at https://github.com/Homebrew/homebrew-core/issues/new/choose instead. ### `brew config` output ```shell HOMEBREW_VERSION: 6.0.5 ORIGIN: https://github.com/Homebrew/brew HEAD: fd9b97148a778b9b34fb743ef066af110ae7bff6 Last commit: 31 hours ago Branch: stable Core tap: N/A HOMEBREW_PREFIX: /home/linuxbrew/.linuxbrew HOMEBREW_CASK_OPTS: [] HOMEBREW_DISPLAY: :0 HOMEBREW_DOWNLOAD_CONCURRENCY: 32 HOMEBREW_EDITOR: nvim HOMEBREW_FORBID_PACKAGES_FROM_PATHS: set HOMEBREW_MAKE_JOBS: 16 HOMEBREW_REQUIRE_TAP_TRUST: set Homebrew Ruby: 4.0.5 => /var/home/linuxbrew/.linuxbrew/Homebrew/Library/Homebrew/vendor/portable-ruby/4.0.5_1/bin/ruby CPU: 16-core 64-bit tigerlake Clang: N/A Git: 2.54.0 => /home/linuxbrew/.linuxbrew/bin/git Curl: 8.18.0 => /bin/curl Kernel: Linux 7.0.8-200.fc44.x86_64 x86_64 GNU/Linux OS: Bluefin (Version: 44.20260609) (Deinonychus) Host glibc: 2.43 Host libstdc++: 6.0.35 /usr/bin/gcc: 16.1.1 /usr/bin/ruby: N/A glibc: N/A gcc@13: N/A gcc: N/A xorg: N/A ``` ### What were you trying to do (and why)? Trying to install tmux & tpack This is related to the other two defects I raised against `--jobs auto` ### What happened (include all command output)? ``` Installing tmux Installing tpack Error: A `brew install --cask tmuxpack/tpack/tpack --adopt` process has already locked /home/linuxbrew/.linuxbrew/Cellar/linux-headers@6.8. Please wait for it to finish or terminate it to continue. Installing tpack has failed! `brew bundle` failed! 1 Brewfile dependency failed to install (exit 1) ``` ### What did you expect to happen? tmux and tpack installed ### Step-by-step reproduction instructions (running `brew` commands) ```shell brewfile contains brew "tmux" cask "tmuxpack/tpack/tpack" ```