Skip TPM plugin install when tmux is unavailable in Debian Codespace builds

[Copilot]

Debian 12/13 Codespace CI builds were failing during bootstrap.sh because TPM plugin installation unconditionally invoked tmux in environments where tmux is intentionally not installed. This change makes TPM setup tolerant of tmux-less bootstrap contexts.

• Root cause

  • all-install.sh cloned ~/.tmux/plugins/tpm and always ran ~/.tmux/plugins/tpm/bin/install_plugins, which fails when tmux is not on PATH.

• Change

  • Added a command -v tmux guard before running TPM plugin installation.
  • Preserved TPM clone behavior; only plugin installation is skipped when tmux is absent.

• Resulting behavior

  • Bootstrap continues successfully in CI/container setups without tmux.
  • On hosts with tmux installed, TPM plugins are still installed as before.

if [ ! -d ~/.tmux/plugins/tpm ]; then
  git clone https://github.com/tmux-plugins/tpm ~/.tmux/plugins/tpm
  if command -v tmux &> /dev/null; then
    ~/.tmux/plugins/tpm/bin/install_plugins
  else
    echo "Skipping tmux plugin installation because tmux is not installed."
  fi
fi

[Copilot]

Pull request overview

This PR makes the shared install bootstrap tolerate Debian Codespace/container environments where tmux is intentionally absent, preventing TPM plugin installation from aborting the build.

Changes:

• Adds a command -v tmux guard before running TPM’s install_plugins.
• Emits a skip message when TPM is cloned but tmux is unavailable.
• Preserves existing TPM clone behavior for later tmux-based setup.

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