Add --completions flag to init command with automatic shell detection

[Copilot]

The init command now supports automatic shell completion installation via --completions flag. Detects shell type from environment and installs appropriate completion configuration.

Changes

• Shell detection (pkg/cli/shell_completion.go)

  • Prioritizes shell version variables (BASH_VERSION, ZSH_VERSION, FISH_VERSION)
  • Falls back to $SHELL environment variable
  • Handles Windows PowerShell detection

• Installation handlers per shell type

  • Bash: ~/.bash_completion.d/gh-aw with sourcing instructions
  • Zsh: ~/.zsh/completions/_gh-aw with fpath configuration
  • Fish: ~/.config/fish/completions/gh-aw.fish (auto-loaded)
  • PowerShell: Profile configuration instructions

• Integration into InitRepository

  • Added completions parameter to function signature
  • Uses Cobra's GenBashCompletion, GenZshCompletion, GenFishCompletion methods
  • Provides user instructions for enabling completions

Usage

gh aw init --completions

Output shows detected shell, installation path, and activation instructions:

ℹ Detected shell: bash
✓ Installed bash completion to: /home/user/.bash_completion.d/gh-aw

ℹ To enable completions, add the following to your ~/.bashrc:
  for f in ~/.bash_completion.d/*; do [ -f "$f" ] && source "$f"; done

Original prompt

Add a "--completions" flag to command "init" that configures cli completion for the current terminal environment.

Must detect automatically the current cli type (bash vs fish vs zsh vs ...) and configure it for completions

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