Use GenZshCompletion (native zsh) instead of the old bash-wrapper method.
Use GenBashCompletionV2 for modern bash completions. Fix help text to show
proper fpath-based zsh installation instead of `source`.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
Add completion command for bash/zsh/fish/powershell generation. Organize
help text using Cobra command groups (Task Commands, Reports, Other).
Register dynamic ValidArgsFunction on filter-accepting commands to
suggest +tag and project:name completions from the database.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>